diff --git a/gui-daemon/xside.c b/gui-daemon/xside.c
index 9843132d..91669932 100644
--- a/gui-daemon/xside.c
+++ b/gui-daemon/xside.c
@@ -3504,7 +3504,8 @@ static void handle_message(Ghandles * g)
             break;
         vm_window->is_mapped = 0;
         (void) XUnmapWindow(g->display, vm_window->local_winid);
-        release_mapped_mfns(g, vm_window);
+        if (vm_window->remote_winid != FULLSCREEN_WINDOW_ID)
+            release_mapped_mfns(g, vm_window);
         break;
     case MSG_CONFIGURE:
         handle_configure_from_vm(g, vm_window);