diff --git a/mozilla/widget/src/mac/nsToolkitBase.h b/mozilla/widget/src/mac/nsToolkitBase.h
index 046ceccaf5c..555ee999d51 100644
--- a/mozilla/widget/src/mac/nsToolkitBase.h
+++ b/mozilla/widget/src/mac/nsToolkitBase.h
@@ -46,7 +46,7 @@
 #include "nsIEventQueueService.h"
 #include "nsIObserver.h"
 
-class nsToolkitBase : public nsIToolkit : public nsIObserver
+class nsToolkitBase : public nsIToolkit, public nsIObserver
 {
 public:
                     nsToolkitBase();