--- src/evolution-indicator.c.orig	2019-11-02 14:16:59.793068602 +0100
+++ src/evolution-indicator.c	2019-11-02 13:40:57.716515338 +0100
@@ -116,45 +116,54 @@
 evolution_is_focused (void)
 {
 #define MAIL_ICON "evolution-mail"
+  EShell *evo_shell;
+  EShellWindow *shell_window;
+#ifdef GDK_WINDOWING_X11
+  static GdkDisplay *display = NULL;
   static GdkScreen *screen = NULL;
   static GdkWindow *root = NULL;
   gboolean          res = FALSE;
   Window            xwindow;
-  EShell *evo_shell;
-  EShellWindow *shell_window;
   
   /* Try and do a match through X, by grabbing the current active window and
      checking to see if it's an evolution window */
-  if (screen == NULL || root == NULL)
+  if (display == NULL || screen == NULL || root == NULL)
   {
+    display = gdk_display_get_default ();
     screen = gdk_screen_get_default ();
     root = gdk_screen_get_root_window (screen);
   }
 
   xwindow = None;
+
+  if (GDK_IS_X11_DISPLAY(display)) {
 #if GTK_CHECK_VERSION(2, 91, 0)
-  res = _wnck_get_window (GDK_WINDOW_XID (root), 
+    res = _wnck_get_window (GDK_WINDOW_XID (root), 
+        gdk_x11_get_xatom_by_name ("_NET_ACTIVE_WINDOW"),
+        &xwindow);
 #else
-  res = _wnck_get_window (GDK_WINDOW_XWINDOW (root),
+    res = _wnck_get_window (GDK_WINDOW_XWINDOW (root),
+        gdk_x11_get_xatom_by_name ("_NET_ACTIVE_WINDOW"),
+        &xwindow);
 #endif
-                    gdk_x11_get_xatom_by_name ("_NET_ACTIVE_WINDOW"),
-                    &xwindow);
-  if (res)
-  {
-    gchar *res_class = NULL;
-    gchar *res_name = NULL;
+    if (res)
+    {
+      gchar *res_class = NULL;
+      gchar *res_name = NULL;
 
-    _wnck_get_wmclass (xwindow, &res_class, &res_name);
+      _wnck_get_wmclass (xwindow, &res_class, &res_name);
 
-    if (!g_strcmp0 (res_name, "evolution"))
-    {
+      if (!g_strcmp0 (res_name, "evolution"))
+      {
+        g_free (res_class);
+        g_free (res_name);
+        return TRUE;
+      }
       g_free (res_class);
       g_free (res_name);
-      return TRUE;
     }
-    g_free (res_class);
-    g_free (res_name);
   }
+#endif
 
   evo_shell = e_shell_get_default ();