--- a/js/src/jsproxy.cpp
+++ b/js/src/jsproxy.cpp
@@ -1329,17 +1329,17 @@ FixProxy(JSContext *cx, JSObject *proxy,
 
     /*
      * Make a blank object from the recipe fix provided to us.  This must have
      * number of fixed slots as the proxy so that we can swap their contents.
      */
     gc::FinalizeKind kind = gc::FinalizeKind(proxy->arena()->header()->thingKind);
     JSObject *newborn = NewNonFunction<WithProto::Given>(cx, clasp, proto, parent, kind);
     if (!newborn)
-        return NULL;
+        return false;
     AutoObjectRooter tvr2(cx, newborn);
 
     if (clasp == &CallableObjectClass) {
         newborn->setSlot(JSSLOT_CALLABLE_CALL, GetCall(proxy));
         newborn->setSlot(JSSLOT_CALLABLE_CONSTRUCT, GetConstruct(proxy));
     }
 
     {