diff --git a/client.c b/client.c
index f1a41926..bb204e20 100644
--- a/client.c
+++ b/client.c
@@ -54,6 +54,7 @@ luaA_client_gc(lua_State *L)
     button_array_wipe(&c->buttons);
     key_array_wipe(&c->keys);
     image_unref(L, c->icon);
+    xcb_get_wm_protocols_reply_wipe(&c->protocols);
     p_delete(&c->class);
     p_delete(&c->startup_id);
     p_delete(&c->instance);
@@ -510,6 +511,7 @@ client_manage(xcb_window_t w, xcb_get_geometry_reply_t *wgeom, int phys_screen,
     property_update_wm_name(c);
     property_update_wm_icon_name(c);
     property_update_wm_class(c, NULL);
+    property_update_wm_protocols(c);
 
     xutil_text_prop_get(globalconf.connection, c->win, _NET_STARTUP_ID, &c->startup_id, NULL);
 
diff --git a/client.h b/client.h
index e7ac0e38..8c41b91b 100644
--- a/client.h
+++ b/client.h
@@ -130,6 +130,8 @@ struct client_t
     xcb_window_t group_win;
     /** Window holding command needed to start it (session management related) */
     xcb_window_t leader_win;
+    /** Client's WM_PROTOCOLS property */
+    xcb_get_wm_protocols_reply_t protocols;
     /** Client logical screen */
     screen_t *screen;
     /** Client physical screen */
diff --git a/property.c b/property.c
index b9322e1c..e2cfa41c 100644
--- a/property.c
+++ b/property.c
@@ -365,6 +365,41 @@ property_handle_net_wm_icon(void *data,
     return 0;
 }
 
+/** Update the list of supported protocols for a client.
+ * \param c The client.
+ */
+void
+property_update_wm_protocols(client_t *c)
+{
+    xcb_get_wm_protocols_reply_t protocols;
+
+    /* If this fails for any reason, we still got the old value */
+    if(xcb_get_wm_protocols_reply(globalconf.connection,
+                                  xcb_get_wm_protocols_unchecked(globalconf.connection,
+                                                                 c->win, WM_PROTOCOLS),
+                                  &protocols, NULL))
+    {
+        xcb_get_wm_protocols_reply_wipe(&c->protocols);
+        memcpy(&c->protocols, &protocols, sizeof(protocols));
+    }
+}
+
+static int
+property_handle_wm_protocols(void *data,
+                             xcb_connection_t *connection,
+                             uint8_t state,
+                             xcb_window_t window,
+                             xcb_atom_t name,
+                             xcb_get_property_reply_t *reply)
+{
+    client_t *c = client_getbywin(window);
+
+    if(c)
+        property_update_wm_protocols(c);
+
+    return 0;
+}
+
 /** The property notify event handler.
  * \param data currently unused.
  * \param connection The connection to the X server.
@@ -447,6 +482,8 @@ void a_xcb_set_property_handlers(void)
                              property_handle_wm_icon_name, NULL);
     xcb_property_set_handler(&globalconf.prophs, WM_CLASS, UINT_MAX,
                              property_handle_wm_class, NULL);
+    xcb_property_set_handler(&globalconf.prophs, WM_PROTOCOLS, UINT_MAX,
+                             property_handle_wm_protocols, NULL);
 
     /* EWMH stuff */
     xcb_property_set_handler(&globalconf.prophs, _NET_WM_NAME, UINT_MAX,
diff --git a/property.h b/property.h
index 259821f2..f492d10a 100644
--- a/property.h
+++ b/property.h
@@ -31,6 +31,7 @@ void property_update_wm_hints(client_t *, xcb_get_property_reply_t *);
 void property_update_wm_class(client_t *, xcb_get_property_reply_t *);
 void property_update_wm_name(client_t *);
 void property_update_wm_icon_name(client_t *);
+void property_update_wm_protocols(client_t *);
 void a_xcb_set_property_handlers(void);
 
 #endif