diff --git a/packages/altair-app/src/polyfills.ts b/packages/altair-app/src/polyfills.ts
index bbc57ec91f..b2be8bde91 100644
--- a/packages/altair-app/src/polyfills.ts
+++ b/packages/altair-app/src/polyfills.ts
@@ -36,7 +36,7 @@
 /** Evergreen browsers require these. **/
 import 'core-js/es/reflect';
 
-(window as any).__zone_symbol__BLACK_LISTED_EVENTS = ['message'];
+// (window as any).__zone_symbol__BLACK_LISTED_EVENTS = ['message'];
 
 /** *************************************************************************************************
  * Zone JS is required by Angular itself.