diff --git a/TaggablePSR6PoolAdapter.php b/TaggablePSR6PoolAdapter.php
index aebc9db..59b6d28 100644
--- a/TaggablePSR6PoolAdapter.php
+++ b/TaggablePSR6PoolAdapter.php
@@ -227,7 +227,7 @@ protected function getList($name)
     /**
      * {@inheritdoc}
      */
-    private function getTagKey($tag)
+    protected function getTagKey($tag)
     {
         return '__tag.'.$tag;
     }