diff --git a/panel/panel-application.c b/panel/panel-application.c
index 9fa863f..3fb9492 100644
--- a/panel/panel-application.c
+++ b/panel/panel-application.c
@@ -147,7 +147,8 @@ typedef struct
   PanelApplication *application;
 
   Display          *dpy;
-  Atom              wm_atom;
+  Atom             *atoms;
+  guint             atom_count;
   guint             have_wm : 1;
   guint             counter;
 }
@@ -408,8 +409,18 @@ static gboolean
 panel_application_wait_for_window_manager (gpointer data)
 {
   WaitForWM *wfwm = data;
-
-  if (XGetSelectionOwner (wfwm->dpy, wfwm->wm_atom) != None)
+  gboolean wm_ready;
+  guint i;
+
+  wm_ready = TRUE;
+  for (i = 0; i < wfwm->atom_count; i++)
+    if (XGetSelectionOwner (wfwm->dpy, wfwm->atoms[i]) == None)
+      {
+        wm_ready = FALSE;
+        break;
+      }
+
+  if (wm_ready)
     wfwm->have_wm = TRUE;
 
   /* abort if a window manager is found or 5 seconds expired */
@@ -437,6 +448,7 @@ panel_application_wait_for_window_manager_destroyed (gpointer data)
                    wfwm->counter);
     }
 
+  g_free (wfwm->atoms);
   XCloseDisplay (wfwm->dpy);
   g_slice_free (WaitForWM, wfwm);
 
@@ -1168,6 +1180,9 @@ panel_application_load (PanelApplication  *application,
 {
 #ifdef GDK_WINDOWING_X11
   WaitForWM *wfwm;
+  guint i;
+  gchar atom_name[16];
+  gchar **atom_names;
 
   if (!disable_wm_check)
     {
@@ -1175,14 +1190,29 @@ panel_application_load (PanelApplication  *application,
       wfwm = g_slice_new0 (WaitForWM);
       wfwm->application = application;
       wfwm->dpy = XOpenDisplay (NULL);
-      wfwm->wm_atom = XInternAtom (wfwm->dpy, "WM_S0", False);
       wfwm->have_wm = FALSE;
       wfwm->counter = 0;
 
+      /* preload wm atoms for all screens */
+      wfwm->atom_count = XScreenCount (wfwm->dpy);
+      wfwm->atoms = g_malloc (sizeof (Atom) * wfwm->atom_count);
+      atom_names = g_malloc (sizeof (gchar *) * wfwm->atom_count);
+
+      for (i = 0; i < wfwm->atom_count; i++)
+        {
+          g_snprintf (atom_name, sizeof (atom_name), "WM_S%d", i);
+          atom_names[i] = atom_name;
+        }
+
+      XInternAtoms (wfwm->dpy, atom_names, wfwm->atom_count, False,
+          wfwm->atoms);
+
       /* setup timeout to check for a window manager */
       application->wait_for_wm_timeout_id =
           g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE, 50, panel_application_wait_for_window_manager,
                             wfwm, panel_application_wait_for_window_manager_destroyed);
+
+      g_free (atom_names);
     }
   else
     {