diff --git a/mozilla/widget/src/mac/nsDeviceContextMac.h b/mozilla/widget/src/mac/nsDeviceContextMac.h
index bec1cef7eb2..40b06b12c79 100644
--- a/mozilla/widget/src/mac/nsDeviceContextMac.h
+++ b/mozilla/widget/src/mac/nsDeviceContextMac.h
@@ -35,7 +35,7 @@ class nsDeviceContextMac : public DeviceContextImpl
 public:
   nsDeviceContextMac();
 
-	NS_DECL_ISUPPORTS
+	NS_DECL_ISUPPORTS_INHERITED
 
   NS_IMETHOD  Init(nsNativeWidget aNativeWidget);