diff --git a/pkg/controller/garbagecollector/graph_builder.go b/pkg/controller/garbagecollector/graph_builder.go
index 1fba4751bdf..e3cb55c3c40 100644
--- a/pkg/controller/garbagecollector/graph_builder.go
+++ b/pkg/controller/garbagecollector/graph_builder.go
@@ -285,13 +285,13 @@ type ownerRefPair struct {
 // when the number of references is small.
 func referencesDiffs(old []metav1.OwnerReference, new []metav1.OwnerReference) (added []metav1.OwnerReference, removed []metav1.OwnerReference, changed []ownerRefPair) {
 	oldUIDToRef := make(map[string]metav1.OwnerReference)
-	for i := 0; i < len(old); i++ {
-		oldUIDToRef[string(old[i].UID)] = old[i]
+	for _, value := range old {
+		oldUIDToRef[string(value.UID)] = value
 	}
 	oldUIDSet := sets.StringKeySet(oldUIDToRef)
 	newUIDToRef := make(map[string]metav1.OwnerReference)
-	for i := 0; i < len(new); i++ {
-		newUIDToRef[string(new[i].UID)] = new[i]
+	for _, value := range new {
+		newUIDToRef[string(value.UID)] = value
 	}
 	newUIDSet := sets.StringKeySet(newUIDToRef)