diff --git a/packages/core/src/callback/index.ts b/packages/core/src/callback/index.ts
index c652633bb..8bc1156cd 100644
--- a/packages/core/src/callback/index.ts
+++ b/packages/core/src/callback/index.ts
@@ -1,5 +1,4 @@
 import { CoreContext } from '../context'
-import { Emitter } from '../emitter'
 import type { Callback } from '../events'
 
 export function pTimeout<T>(promise: Promise<T>, timeout: number): Promise<T> {