diff --git a/screen.c b/screen.c
index 7607d0ae7..a2cf44d0b 100644
--- a/screen.c
+++ b/screen.c
@@ -138,6 +138,20 @@ get_screen_count(Display *disp)
     return screen_number;
 }
 
+/** This returns the real X screen number for a logical
+ * screen if Xinerama is active.
+ * \param disp Display ref
+ * \param screen the logical screen
+ * \return the X screen
+ */
+int
+get_real_screen(Display *disp, int screen)
+{
+    if(XineramaIsActive(disp))
+        return DefaultScreen(disp);
+    return screen;
+}
+
 void
 move_client_to_screen(Client *c, awesome_config *acf_new)
 {
diff --git a/screen.h b/screen.h
index 68cebab1d..89d53a6e7 100644
--- a/screen.h
+++ b/screen.h
@@ -32,6 +32,7 @@ ScreenInfo * get_screen_info(Display *, int, Statusbar *, int *);
 ScreenInfo * get_display_info(Display *, int, Statusbar *);
 int get_screen_bycoord(Display *, int, int);
 int get_screen_count(Display *);
+int get_real_screen(Display *, int);
 void move_client_to_screen(Client *, awesome_config *);
 UICB_PROTO(uicb_focusnextscreen);
 UICB_PROTO(uicb_focusprevscreen);