diff --git a/dom/xbl/nsXBLProtoImplField.cpp b/dom/xbl/nsXBLProtoImplField.cpp
index 5b57118f8d80..ed79c8db100a 100644
--- a/dom/xbl/nsXBLProtoImplField.cpp
+++ b/dom/xbl/nsXBLProtoImplField.cpp
@@ -245,12 +245,7 @@ FieldGetterImpl(JSContext *cx, JS::CallArgs args)
     return true;
   }
 
-  JS::Rooted<JS::Value> v(cx);
-  if (!JS_GetPropertyById(cx, thisObj, id, &v)) {
-    return false;
-  }
-  args.rval().set(v);
-  return true;
+  return JS_GetPropertyById(cx, thisObj, id, args.rval());
 }
 
 static bool