diff --git a/dom/base/nsGlobalWindow.h b/dom/base/nsGlobalWindow.h
index 7603a8ad39c2..a2886a173d1c 100644
--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -475,7 +475,7 @@ public:
   static bool IsShowModalDialogEnabled(JSContext* /* unused */ = nullptr,
                                        JSObject* /* unused */ = nullptr);
 
-  static bool IsRequestIdleCallbackEnabled(JSContext* /* unused */, JSObject* aObj);
+  static bool IsRequestIdleCallbackEnabled(JSContext* aCx, JSObject* /* unused */);
 
   bool DoResolve(JSContext* aCx, JS::Handle<JSObject*> aObj,
                  JS::Handle<jsid> aId,