diff --git a/lib/common/utils.ts b/lib/common/utils.ts
index 66ae022fe..92af71d2f 100644
--- a/lib/common/utils.ts
+++ b/lib/common/utils.ts
@@ -347,7 +347,7 @@ export function patchMethod(target: any, name: string,
                                       name: string) => (self: any, args: any[]) => any): Function
 {
   let proto = target;
-  while (proto && !proto.hasOwnProperty(name)) {
+  while (proto && Object.getOwnPropertyNames(proto).indexOf(name) === -1) {
     proto = Object.getPrototypeOf(proto);
   }
   if (!proto && target[name]) {