diff --git a/toolkit/xre/nsGDKErrorHandler.cpp b/toolkit/xre/nsGDKErrorHandler.cpp
index 0f0e2d5573ca..a01a7c53b247 100644
--- a/toolkit/xre/nsGDKErrorHandler.cpp
+++ b/toolkit/xre/nsGDKErrorHandler.cpp
@@ -8,7 +8,11 @@
 #include <gtk/gtk.h>
 #include <gdk/gdkx.h>
 #include <errno.h>
+#include <stdlib.h>
+#include <string.h>
 
+#include "nsDebug.h"
+#include "nsString.h"
 #include "nsX11ErrorHandler.h"
 
 #include "prenv.h"