diff --git a/src/wayland/meta-wayland-xdg-shell.c b/src/wayland/meta-wayland-xdg-shell.c
index 240970c08..5321467a6 100644
--- a/src/wayland/meta-wayland-xdg-shell.c
+++ b/src/wayland/meta-wayland-xdg-shell.c
@@ -35,6 +35,13 @@
 #include "wayland/meta-window-wayland.h"
 #include "xdg-shell-unstable-v5-server-protocol.h"
 
+/*
+ * Define GNOME additional states to xdg-shell
+ * The current reserved range for GNOME is 0x1000 - 0x1FFF
+ */
+
+#define XDG_SURFACE_STATE_GNOME_TILED 0x1000
+
 struct _MetaWaylandXdgSurface
 {
   MetaWaylandSurfaceRoleShellSurface parent;
@@ -399,6 +406,13 @@ fill_states (struct wl_array *states, MetaWindow *window)
       s = wl_array_add (states, sizeof *s);
       *s = XDG_SURFACE_STATE_ACTIVATED;
     }
+  /* GNOME extension to xdg-shell states */
+  if (window->tile_mode == META_TILE_LEFT ||
+      window->tile_mode == META_TILE_RIGHT)
+    {
+      s = wl_array_add (states, sizeof *s);
+      *s = XDG_SURFACE_STATE_GNOME_TILED;
+    }
 }
 
 static void