diff --git a/pkg/reconciler/filter.go b/pkg/reconciler/filter.go
deleted file mode 100644
index 8e08da324e1..00000000000
--- a/pkg/reconciler/filter.go
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
-Copyright 2023 The Knative Authors
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-	http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package reconciler
-
-import (
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
-)
-
-// FilterWithNamespace makes it simple to create FilterFunc's for use with
-// cache.FilteringResourceEventHandler that filter based on a name.
-func FilterWithNamespace(namespace string) func(obj interface{}) bool {
-	return func(obj interface{}) bool {
-		if object, ok := obj.(metav1.Object); ok {
-			return namespace == object.GetNamespace()
-		}
-		return false
-	}
-}