diff --git a/awesome.c b/awesome.c
index 0547c0a4..5659a198 100644
--- a/awesome.c
+++ b/awesome.c
@@ -79,7 +79,7 @@ scan(void)
     for(screen = 0; screen < screen_max; screen++)
     {
         /* Get the root window ID associated to this screen */
-        root_wins[screen].id = xcb_aux_get_screen(globalconf.connection, screen)->root;
+        root_wins[screen].id = xutil_screen_get(globalconf.connection, screen)->root;
 
         /* Get the window tree associated to this screen */
         root_wins[screen].tree_cookie = xcb_query_tree_unchecked(globalconf.connection,
@@ -384,7 +384,7 @@ main(int argc, char **argv)
 
         /* This causes an error if some other window manager is running */
         xcb_change_window_attributes(globalconf.connection,
-                                     xcb_aux_get_screen(globalconf.connection, screen_nbr)->root,
+                                     xutil_screen_get(globalconf.connection, screen_nbr)->root,
                                      XCB_CW_EVENT_MASK, &select_input_val);
     }
 
@@ -459,7 +459,7 @@ main(int argc, char **argv)
         };
 
         xcb_change_window_attributes(globalconf.connection,
-                                     xcb_aux_get_screen(globalconf.connection, screen_nbr)->root,
+                                     xutil_screen_get(globalconf.connection, screen_nbr)->root,
                                      XCB_CW_EVENT_MASK | XCB_CW_CURSOR,
                                      change_win_vals);
         ewmh_set_supported_hints(screen_nbr);
diff --git a/client.c b/client.c
index 37264771..b380206d 100644
--- a/client.c
+++ b/client.c
@@ -263,7 +263,7 @@ client_focus(client_t *c, int screen)
         phys_screen = screen_virttophys(screen);
         xcb_set_input_focus(globalconf.connection,
                             XCB_INPUT_FOCUS_POINTER_ROOT,
-                            xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+                            xutil_screen_get(globalconf.connection, phys_screen)->root,
                             XCB_CURRENT_TIME);
     }
 
diff --git a/common/draw.c b/common/draw.c
index 34aa38a0..74021d20 100644
--- a/common/draw.c
+++ b/common/draw.c
@@ -44,6 +44,7 @@
 
 #include "common/draw.h"
 #include "common/markup.h"
+#include "common/xutil.h"
 
 /** Convert text from any charset to UTF-8 using iconv
  * \param iso the ISO string to convert
@@ -124,7 +125,7 @@ draw_context_new(xcb_connection_t *conn, int phys_screen,
                  xcolor_t fg, xcolor_t bg)
 {
     draw_context_t *d = p_new(draw_context_t, 1);
-    xcb_screen_t *s = xcb_aux_get_screen(conn, phys_screen);
+    xcb_screen_t *s = xutil_screen_get(conn, phys_screen);
 
     d->connection = conn;
     d->phys_screen = phys_screen;
@@ -152,7 +153,7 @@ font_t *
 draw_font_new(xcb_connection_t *conn, int phys_screen, const char *fontname)
 {
     cairo_surface_t *surface;
-    xcb_screen_t *s = xcb_aux_get_screen(conn, phys_screen);
+    xcb_screen_t *s = xutil_screen_get(conn, phys_screen);
     cairo_t *cr;
     PangoLayout *layout;
     font_t *font = p_new(font_t, 1);
@@ -980,7 +981,7 @@ draw_text_extents(xcb_connection_t *conn, int phys_screen, font_t *font, const c
     cairo_t *cr;
     PangoLayout *layout;
     PangoRectangle ext;
-    xcb_screen_t *s = xcb_aux_get_screen(conn, phys_screen);
+    xcb_screen_t *s = xutil_screen_get(conn, phys_screen);
     area_t geom = { 0, 0, 0, 0, NULL, NULL };
     ssize_t len;
     char *buf, *utf8;
@@ -1060,7 +1061,7 @@ draw_align_get_from_str(const char *align)
 bool
 xcolor_new(xcb_connection_t *conn, int phys_screen, const char *colstr, xcolor_t *color)
 {
-    xcb_screen_t *s = xcb_aux_get_screen(conn, phys_screen);
+    xcb_screen_t *s = xutil_screen_get(conn, phys_screen);
     xcb_alloc_color_reply_t *hexa_color = NULL;
     xcb_alloc_named_color_reply_t *named_color = NULL;
     unsigned long colnum;
diff --git a/common/swindow.c b/common/swindow.c
index 9df06866..c3d5079d 100644
--- a/common/swindow.c
+++ b/common/swindow.c
@@ -23,6 +23,7 @@
 #include <xcb/xcb_aux.h>
 
 #include "common/swindow.h"
+#include "common/xutil.h"
 
 /** Create a simple window.
  * \param conn Connection ref.
@@ -41,7 +42,7 @@ simplewindow_new(xcb_connection_t *conn, int phys_screen, int x, int y,
                  unsigned int border_width)
 {
     simple_window_t *sw;
-    xcb_screen_t *s = xcb_aux_get_screen(conn, phys_screen);
+    xcb_screen_t *s = xutil_screen_get(conn, phys_screen);
     uint32_t create_win_val[3];
     const uint32_t gc_mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
     const uint32_t gc_values[2] = { s->black_pixel, s->white_pixel };
@@ -106,7 +107,7 @@ simplewindow_move(simple_window_t *sw, int x, int y)
 void
 simplewindow_resize(simple_window_t *sw, unsigned int w, unsigned int h)
 {
-    xcb_screen_t *s = xcb_aux_get_screen(sw->connection, sw->phys_screen);
+    xcb_screen_t *s = xutil_screen_get(sw->connection, sw->phys_screen);
     const uint32_t resize_win_vals[] = { w, h };
     xcb_pixmap_t d;
 
@@ -134,7 +135,7 @@ simplewindow_moveresize(simple_window_t *sw, int x, int y,
 {
     const uint32_t moveresize_win_vals[] = { x, y, w, h };
     xcb_pixmap_t d;
-    xcb_screen_t *s = xcb_aux_get_screen(sw->connection, sw->phys_screen);
+    xcb_screen_t *s = xutil_screen_get(sw->connection, sw->phys_screen);
 
     sw->geometry.x = x;
     sw->geometry.y = y;
diff --git a/common/xscreen.c b/common/xscreen.c
index a6393b86..7fbaa334 100644
--- a/common/xscreen.c
+++ b/common/xscreen.c
@@ -24,6 +24,7 @@
 #include <xcb/xinerama.h>
 
 #include "common/xscreen.h"
+#include "common/xutil.h"
 
 /** Return the Xinerama screen number where the coordinates belongs to.
  * \param si The screens infos structure.
@@ -144,7 +145,7 @@ screensinfo_new(xcb_connection_t *conn)
         si->geometry = p_new(area_t, si->nscreen);
         for(screen = 0; screen < si->nscreen; screen++)
         {
-            s = xcb_aux_get_screen(conn, screen);
+            s = xutil_screen_get(conn, screen);
             si->geometry[screen].x = 0;
             si->geometry[screen].y = 0;
             si->geometry[screen].width = s->width_in_pixels;
diff --git a/common/xutil.h b/common/xutil.h
index fd6ca35a..d91be82d 100644
--- a/common/xutil.h
+++ b/common/xutil.h
@@ -26,6 +26,7 @@
 
 #include <xcb/xcb.h>
 #include <xcb/xcb_keysyms.h>
+#include <xcb/xcb_aux.h>
 #include <xcb/xcb_event.h>
 
 /* XCB doesn't provide keysyms definition */
@@ -160,5 +161,19 @@ xcb_keysym_t xutil_keymask_fromstr(const char *);
 unsigned int xutil_button_fromint(int);
 xcb_cursor_t xutil_cursor_new(xcb_connection_t *, unsigned int);
 
+/* Get the informations about the screen.
+ * \param c X connection.
+ * \param screen Screen number.
+ * \return Screen informations (must not be freed!).
+ */
+static inline xcb_screen_t *
+xutil_screen_get(xcb_connection_t *c, int screen)
+{
+    if(xcb_connection_has_error(c))
+        eprint("X connection invalid");
+
+    return xcb_aux_get_screen(c, screen);
+}
+
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
diff --git a/event.c b/event.c
index 0c1672dd..5d330d4b 100644
--- a/event.c
+++ b/event.c
@@ -163,7 +163,7 @@ event_handle_buttonpress(void *data __attribute__ ((unused)),
     }
     else
         for(screen = 0; screen < nb_screen; screen++)
-            if(xcb_aux_get_screen(connection, screen)->root == ev->event)
+            if(xutil_screen_get(connection, screen)->root == ev->event)
             {
                 event_handle_mouse_button_press(NULL, ev->detail, ev->state,
                                                 globalconf.buttons.root);
@@ -279,7 +279,7 @@ event_handle_configurenotify(void *data __attribute__ ((unused)),
     const xcb_screen_t *screen;
 
     for(screen_nbr = 0; screen_nbr < xcb_setup_roots_length(xcb_get_setup (connection)); screen_nbr++)
-        if((screen = xcb_aux_get_screen(connection, screen_nbr)) != NULL
+        if((screen = xutil_screen_get(connection, screen_nbr)) != NULL
            && ev->window == screen->root
            && (ev->width != screen->width_in_pixels
                || ev->height != screen->height_in_pixels))
@@ -340,7 +340,7 @@ event_handle_enternotify(void *data __attribute__ ((unused)),
     }
     else if((emwin = xembed_getbywin(globalconf.embedded, ev->event)))
         xcb_ungrab_button(globalconf.connection, XCB_BUTTON_INDEX_ANY,
-                          xcb_aux_get_screen(connection, emwin->phys_screen)->root,
+                          xutil_screen_get(connection, emwin->phys_screen)->root,
                           ANY_MODIFIER);
     else
         window_root_grabbuttons(ev->root);
@@ -458,7 +458,7 @@ event_handle_maprequest(void *data __attribute__ ((unused)),
         geom_c = xcb_get_geometry(connection, ev->window);
 
         if(globalconf.screens_info->xinerama_is_active)
-            qp_c = xcb_query_pointer(connection, xcb_aux_get_screen(globalconf.connection,
+            qp_c = xcb_query_pointer(connection, xutil_screen_get(globalconf.connection,
                                                                     screen_nbr)->root);
 
         if(!(geom_r = xcb_get_geometry_reply(connection, geom_c, NULL)))
@@ -552,7 +552,7 @@ event_handle_unmapnotify(void *data __attribute__ ((unused)),
     bool send_event = ((ev->response_type & 0x80) >> 7);
 
     if((c = client_getbywin(ev->window))
-       && ev->event == xcb_aux_get_screen(connection, c->phys_screen)->root
+       && ev->event == xutil_screen_get(connection, c->phys_screen)->root
        && send_event && window_getstate(c->win) == XCB_WM_NORMAL_STATE)
         client_unmanage(c);
 
diff --git a/ewmh.c b/ewmh.c
index 9dc1f6ee..4e552e49 100644
--- a/ewmh.c
+++ b/ewmh.c
@@ -163,7 +163,7 @@ ewmh_set_supported_hints(int phys_screen)
     atom[i++] = net_wm_state_hidden;
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
-			xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+			xutil_screen_get(globalconf.connection, phys_screen)->root,
 			net_supported, ATOM, 32, i, atom);
 }
 
@@ -184,7 +184,7 @@ ewmh_update_net_client_list(int phys_screen)
             wins[n] = c->win;
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
-			xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+			xutil_screen_get(globalconf.connection, phys_screen)->root,
 			net_client_list, WINDOW, 32, n, wins);
 
     p_delete(&wins);
@@ -200,7 +200,7 @@ ewmh_update_net_numbers_of_desktop(int phys_screen)
         count++;
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
-			xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+			xutil_screen_get(globalconf.connection, phys_screen)->root,
 			net_number_of_desktops, CARDINAL, 32, 1, &count);
 }
 
@@ -214,7 +214,7 @@ ewmh_update_net_current_desktop(int phys_screen)
         count++;
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
-                        xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+                        xutil_screen_get(globalconf.connection, phys_screen)->root,
                         net_current_desktop, CARDINAL, 32, 1, &count);
 
     p_delete(&curtags);
@@ -238,7 +238,7 @@ ewmh_update_net_desktop_names(int phys_screen)
     }
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
-			xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+			xutil_screen_get(globalconf.connection, phys_screen)->root,
 			net_desktop_names, utf8_string, 8, len, buf);
 }
 
@@ -251,7 +251,7 @@ ewmh_update_net_active_window(int phys_screen)
     win = sel ? sel->win : XCB_NONE;
 
     xcb_change_property(globalconf.connection, XCB_PROP_MODE_REPLACE,
-			xcb_aux_get_screen(globalconf.connection, phys_screen)->root,
+			xutil_screen_get(globalconf.connection, phys_screen)->root,
 			net_active_window, WINDOW, 32, 1, &win);
 }
 
@@ -392,7 +392,7 @@ ewmh_process_client_message(xcb_client_message_event_t *ev)
             screen < xcb_setup_roots_length(xcb_get_setup(globalconf.connection));
             screen++)
         {
-            if(ev->window == xcb_aux_get_screen(globalconf.connection, screen)->root)
+            if(ev->window == xutil_screen_get(globalconf.connection, screen)->root)
                 tag_view_only_byindex(screen, ev->data.data32[0]);
         }
 
diff --git a/keygrabber.c b/keygrabber.c
index ffee0f81..4204dee0 100644
--- a/keygrabber.c
+++ b/keygrabber.c
@@ -667,7 +667,7 @@ keygrabber_grab(void)
     {
         if((xgb = xcb_grab_keyboard_reply(globalconf.connection,
                                           xcb_grab_keyboard(globalconf.connection, true,
-                                                            xcb_aux_get_screen(globalconf.connection,
+                                                            xutil_screen_get(globalconf.connection,
                                                                                globalconf.default_screen)->root,
                                                             XCB_CURRENT_TIME, XCB_GRAB_MODE_ASYNC,
                                                             XCB_GRAB_MODE_ASYNC),
diff --git a/layout.c b/layout.c
index 8d10b23e..cde8276f 100644
--- a/layout.c
+++ b/layout.c
@@ -59,7 +59,7 @@ arrange(int screen)
     }
 
     qp_c = xcb_query_pointer_unchecked(globalconf.connection,
-                                       xcb_aux_get_screen(globalconf.connection,
+                                       xutil_screen_get(globalconf.connection,
                                                           phys_screen)->root);
 
     /* check that the mouse is on a window or not */
diff --git a/mouse.c b/mouse.c
index 550b18f5..b029befe 100644
--- a/mouse.c
+++ b/mouse.c
@@ -419,7 +419,7 @@ mouse_get_client_under_pointer(void)
     xcb_query_pointer_reply_t *query_ptr_r;
     client_t *c = NULL;
 
-    root = xcb_aux_get_screen(globalconf.connection, globalconf.default_screen)->root;
+    root = xutil_screen_get(globalconf.connection, globalconf.default_screen)->root;
 
     query_ptr_c = xcb_query_pointer_unchecked(globalconf.connection, root);
     query_ptr_r = xcb_query_pointer_reply(globalconf.connection, query_ptr_c, NULL);
@@ -454,7 +454,7 @@ mouse_client_move(client_t *c, int snap, bool infobox)
     xcb_window_t root;
 
     layout = layout_get_current(c->screen);
-    root = xcb_aux_get_screen(globalconf.connection, c->phys_screen)->root;
+    root = xutil_screen_get(globalconf.connection, c->phys_screen)->root;
 
     /* get current pointer position */
     mouse_query_pointer(root, &last_x, &last_y);
@@ -561,7 +561,7 @@ mouse_client_resize_floating(client_t *c, corner_t corner, bool infobox)
     size_t cursor = CurResize;
     int top, bottom, left, right;
 
-    screen = xcb_aux_get_screen(globalconf.connection, c->phys_screen);
+    screen = xutil_screen_get(globalconf.connection, c->phys_screen);
 
     /* get current mouse position */
     mouse_query_pointer(screen->root, &mouse_x, &mouse_y);
@@ -656,7 +656,7 @@ mouse_client_resize_tiled(client_t *c)
     int mouse_x, mouse_y;
     size_t cursor = CurResize;
 
-    screen = xcb_aux_get_screen(globalconf.connection, c->phys_screen);
+    screen = xutil_screen_get(globalconf.connection, c->phys_screen);
     tag = tags_get_current(c->screen)[0];
     layout = tag->layout;
 
@@ -763,7 +763,7 @@ mouse_client_resize_magnified(client_t *c, bool infobox)
 
     tag = tags_get_current(c->screen)[0];
 
-    root = xcb_aux_get_screen(globalconf.connection, c->phys_screen)->root;
+    root = xutil_screen_get(globalconf.connection, c->phys_screen)->root;
 
     area = screen_area_get(tag->screen,
                            globalconf.screens[tag->screen].statusbar,
@@ -868,7 +868,7 @@ mouse_client_resize(client_t *c, corner_t corner, bool infobox)
 
     curtags = tags_get_current(c->screen);
     layout = curtags[0]->layout;
-    s = xcb_aux_get_screen(globalconf.connection, c->phys_screen);
+    s = xutil_screen_get(globalconf.connection, c->phys_screen);
 
     /* only handle floating, tiled and magnifier layouts */
     if(layout == layout_floating || c->isfloating)
@@ -919,7 +919,7 @@ luaA_mouse_coords_set(lua_State *L)
     x = luaL_checknumber(L, 1);
     y = luaL_checknumber(L, 2);
 
-    root = xcb_aux_get_screen(globalconf.connection, globalconf.default_screen)->root;
+    root = xutil_screen_get(globalconf.connection, globalconf.default_screen)->root;
     mouse_warp_pointer(root, x, y);
 
     return 0;
@@ -994,7 +994,7 @@ luaA_mouse_screen_get(lua_State *L)
     int screen, mouse_x, mouse_y;
     xcb_window_t root;
 
-    root = xcb_aux_get_screen(globalconf.connection, globalconf.default_screen)->root;
+    root = xutil_screen_get(globalconf.connection, globalconf.default_screen)->root;
 
     if(!mouse_query_pointer(root, &mouse_x, &mouse_y))
         return 0;
diff --git a/placement.c b/placement.c
index 5ee5c843..8a2c1c87 100644
--- a/placement.c
+++ b/placement.c
@@ -135,7 +135,7 @@ placement_under_mouse(client_t *c)
     area_t finalgeometry = c->f_geometry;
 
     qp_c = xcb_query_pointer(globalconf.connection,
-                             xcb_aux_get_screen(globalconf.connection, c->phys_screen)->root);
+                             xutil_screen_get(globalconf.connection, c->phys_screen)->root);
     if((qp_r = xcb_query_pointer_reply(globalconf.connection, qp_c, NULL)))
     {
         finalgeometry.x = qp_r->root_x - c->f_geometry.width / 2;
diff --git a/screen.c b/screen.c
index dbec291b..44b3fc4e 100644
--- a/screen.c
+++ b/screen.c
@@ -84,7 +84,7 @@ display_area_get(int phys_screen, statusbar_t *statusbar, padding_t *padding)
 {
     area_t area = { 0, 0, 0, 0, NULL, NULL };
     statusbar_t *sb;
-    xcb_screen_t *s = xcb_aux_get_screen(globalconf.connection, phys_screen);
+    xcb_screen_t *s = xutil_screen_get(globalconf.connection, phys_screen);
 
     area.width = s->width_in_pixels;
     area.height = s->height_in_pixels;
diff --git a/statusbar.c b/statusbar.c
index 02d36e84..8650bcc8 100644
--- a/statusbar.c
+++ b/statusbar.c
@@ -167,7 +167,7 @@ statusbar_position_update(statusbar_t *statusbar, position_t position)
         statusbar->sw =
             simplewindow_new(globalconf.connection, statusbar->phys_screen, 0, 0,
                              statusbar->height, statusbar->width, 0);
-        s = xcb_aux_get_screen(globalconf.connection, statusbar->phys_screen);
+        s = xutil_screen_get(globalconf.connection, statusbar->phys_screen);
         /* we need a new pixmap this way [     ] to render */
         dw = xcb_generate_id(globalconf.connection);
         xcb_create_pixmap(globalconf.connection,
diff --git a/systray.c b/systray.c
index b97dd8b5..dae9250a 100644
--- a/systray.c
+++ b/systray.c
@@ -40,7 +40,7 @@ systray_init(int phys_screen)
     xutil_intern_atom_request_t atom_systray_q, atom_manager_q;
     xcb_atom_t atom_systray;
     xcb_client_message_event_t ev;
-    xcb_screen_t *xscreen = xcb_aux_get_screen(globalconf.connection, phys_screen);
+    xcb_screen_t *xscreen = xutil_screen_get(globalconf.connection, phys_screen);
     char atom_name[22];
 
     /* Send requests */
diff --git a/titlebar.c b/titlebar.c
index bfb7fdb1..e2a7e5f1 100644
--- a/titlebar.c
+++ b/titlebar.c
@@ -77,7 +77,7 @@ titlebar_draw(client_t *c)
     if(!c->titlebar || !c->titlebar->sw || !c->titlebar->position)
         return;
 
-    s = xcb_aux_get_screen(globalconf.connection,
+    s = xutil_screen_get(globalconf.connection,
                            c->titlebar->sw->phys_screen);
 
     switch(c->titlebar->position)
diff --git a/widget.c b/widget.c
index 6aff29ea..e44e0723 100644
--- a/widget.c
+++ b/widget.c
@@ -154,7 +154,7 @@ widget_render(widget_node_t *wnode, draw_context_t *ctx, xcb_gcontext_t gc, xcb_
 
     if(ctx->bg.alpha != 0xffff)
     {
-        s = xcb_aux_get_screen(globalconf.connection, ctx->phys_screen);
+        s = xutil_screen_get(globalconf.connection, ctx->phys_screen);
         pixmap_atom = xutil_intern_atom_reply(globalconf.connection, &globalconf.atoms, pixmap_atom_req);
         rootpix_atom = xutil_intern_atom_reply(globalconf.connection, &globalconf.atoms, rootpix_atom_req);
         prop_c = xcb_get_property_unchecked(globalconf.connection, false, s->root, rootpix_atom,
diff --git a/window.c b/window.c
index c8358feb..cddfd1f6 100644
--- a/window.c
+++ b/window.c
@@ -172,7 +172,7 @@ window_root_grabkey(keybinding_t *k)
        || (k->keysym && (kc = xcb_key_symbols_get_keycode(globalconf.keysyms, k->keysym))))
         do
         {
-            s = xcb_aux_get_screen(globalconf.connection, phys_screen);
+            s = xutil_screen_get(globalconf.connection, phys_screen);
             xcb_grab_key(globalconf.connection, true, s->root,
                          k->mod, kc, XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC);
             xcb_grab_key(globalconf.connection, true, s->root,
@@ -201,7 +201,7 @@ window_root_ungrabkey(keybinding_t *k)
        || (k->keysym && (kc = xcb_key_symbols_get_keycode(globalconf.keysyms, k->keysym))))
         do
         {
-            s = xcb_aux_get_screen(globalconf.connection, phys_screen);
+            s = xutil_screen_get(globalconf.connection, phys_screen);
             xcb_ungrab_key(globalconf.connection, kc, s->root,
                            k->mod);
             xcb_ungrab_key(globalconf.connection, kc, s->root,