diff --git a/widget/gtk/mozgtk/mozgtk.c b/widget/gtk/mozgtk/mozgtk.c
index 677f9b356160..d7dbbc6fd9e3 100644
--- a/widget/gtk/mozgtk/mozgtk.c
+++ b/widget/gtk/mozgtk/mozgtk.c
@@ -6,7 +6,8 @@
 
 #include "mozilla/Types.h"
 
-#include <X11/Xlib.h>
+#ifdef MOZ_X11
+#  include <X11/Xlib.h>
 // Bug 1271100
 // We need to trick system Cairo into not using the XShm extension due to
 // a race condition in it that results in frequent BadAccess errors. Cairo
@@ -19,3 +20,4 @@
 // ever can remove this workaround for system Cairo, we'll need something
 // to replace it for that purpose.
 MOZ_EXPORT Bool XShmQueryExtension(Display* aDisplay) { return False; }
+#endif