diff --git a/lib/app.js b/lib/app.js
index dd00614b97e94..ebee26d13970b 100644
--- a/lib/app.js
+++ b/lib/app.js
@@ -87,7 +87,7 @@ export class Container extends Component {
 }
 
 const warnUrl = execOnce(() => {
-  if (process.env.NODE_ENV !== 'PRODUCTION') {
+  if (process.env.NODE_ENV !== 'production') {
     warn(`Warning: the 'url' property is deprecated. https://err.sh/next.js/url-deprecated`)
   }
 })