diff --git a/packages/runtime-core/src/components/KeepAlive.ts b/packages/runtime-core/src/components/KeepAlive.ts
index cca1b8d96..e9c8cce58 100644
--- a/packages/runtime-core/src/components/KeepAlive.ts
+++ b/packages/runtime-core/src/components/KeepAlive.ts
@@ -195,10 +195,10 @@ const KeepAliveImpl: ComponentOptions = {
       _unmount(vnode, instance, parentSuspense, true)
     }
 
-    function pruneCache(filter?: (name: string) => boolean) {
+    function pruneCache(filter: (name: string) => boolean) {
       cache.forEach((vnode, key) => {
         const name = getComponentName(vnode.type as ConcreteComponent)
-        if (name && (!filter || !filter(name))) {
+        if (name && !filter(name)) {
           pruneCacheEntry(key)
         }
       })