diff --git a/src/internal/types.ts b/src/internal/types.ts
index e9ce758b99..d36f765d4f 100644
--- a/src/internal/types.ts
+++ b/src/internal/types.ts
@@ -1,5 +1,4 @@
 import { Observable } from './Observable';
-import { PartialObserver } from './types';
 
 /** OPERATOR INTERFACES */
 
@@ -73,4 +72,4 @@ export interface Observer<T> {
   next: (value: T) => void;
   error: (err: any) => void;
   complete: () => void;
-}
\ No newline at end of file
+}