diff --git a/src/internal/Notification.ts b/src/internal/Notification.ts
index f65f70cd64..b1cf255d62 100644
--- a/src/internal/Notification.ts
+++ b/src/internal/Notification.ts
@@ -3,7 +3,6 @@ import { Observable } from './Observable';
 import { empty } from './observable/empty';
 import { of } from './observable/of';
 import { throwError } from './observable/throwError';
-import { deprecate } from 'util';
 
 // TODO: When this enum is removed, replace it with a type alias. See #4556.
 /**