diff --git a/lib/internal/url.js b/lib/internal/url.js
index ea5cacf30b657b..e23afe3f93e632 100644
--- a/lib/internal/url.js
+++ b/lib/internal/url.js
@@ -17,6 +17,7 @@ const {
   ObjectGetOwnPropertySymbols,
   ObjectGetPrototypeOf,
   ObjectKeys,
+  ObjectPrototypeHasOwnProperty,
   ReflectApply,
   ReflectGetOwnPropertyDescriptor,
   ReflectOwnKeys,
@@ -568,6 +569,10 @@ function onParseComplete(flags, protocol, username, password,
   initSearchParams(this[searchParams], query);
 }
 
+function isURLThis(self) {
+  return self != null && ObjectPrototypeHasOwnProperty(self, context);
+}
+
 function onParseError(input, flags) {
   throw new ERR_INVALID_URL(input);
 }