diff --git a/packages/core/src/change_detection/scheduling/flags.ts b/packages/core/src/change_detection/scheduling/flags.ts
index e37ddd4aa71a..40744855fd35 100644
--- a/packages/core/src/change_detection/scheduling/flags.ts
+++ b/packages/core/src/change_detection/scheduling/flags.ts
@@ -6,4 +6,4 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-export const SCHEDULE_IN_ROOT_ZONE_DEFAULT = true;
+export const SCHEDULE_IN_ROOT_ZONE_DEFAULT = false;