diff --git a/packages/runtime-core/src/apiWatch.ts b/packages/runtime-core/src/apiWatch.ts
index 4999e11f0c9..ce13f0bb805 100644
--- a/packages/runtime-core/src/apiWatch.ts
+++ b/packages/runtime-core/src/apiWatch.ts
@@ -93,9 +93,7 @@ export function watchPostEffect(
   return doWatch(
     effect,
     null,
-    (__DEV__
-      ? { ...options, flush: 'post' }
-      : { flush: 'post' }) as WatchOptionsBase
+    __DEV__ ? { ...options, flush: 'post' } : { flush: 'post' }
   )
 }
 
@@ -106,9 +104,7 @@ export function watchSyncEffect(
   return doWatch(
     effect,
     null,
-    (__DEV__
-      ? { ...options, flush: 'sync' }
-      : { flush: 'sync' }) as WatchOptionsBase
+    __DEV__ ? { ...options, flush: 'sync' } : { flush: 'sync' }
   )
 }