diff --git a/toolkit/system/gnome/nsGnomeModule.cpp b/toolkit/system/gnome/nsGnomeModule.cpp
index 13dbbb7bf1ed..9dbd47e6d975 100644
--- a/toolkit/system/gnome/nsGnomeModule.cpp
+++ b/toolkit/system/gnome/nsGnomeModule.cpp
@@ -39,6 +39,8 @@
 #include "nsToolkitCompsCID.h"
 #include "mozilla/ModuleUtils.h"
 
+#include <glib-object.h>
+
 #ifdef MOZ_ENABLE_GCONF
 #include "nsGConfService.h"
 NS_GENERIC_FACTORY_CONSTRUCTOR_INIT(nsGConfService, Init)