diff --git a/src/ProxyApi/ProxyDataEventSubscriber.php b/src/ProxyApi/ProxyDataEventSubscriber.php
index d2c739843d73b6ba8c5a63a2aaeb6107d5fdb31a..6c5697599c35f065f0460459edc90e99a5df3ee8 100644
--- a/src/ProxyApi/ProxyDataEventSubscriber.php
+++ b/src/ProxyApi/ProxyDataEventSubscriber.php
@@ -10,7 +10,7 @@ use Exception;
 
 class ProxyDataEventSubscriber extends AbstractProxyDataEventSubscriber
 {
-    protected const NAMESPACE = 'core';
+    public const NAMESPACE = 'core';
 
     public const GET_AVAILABLE_ATTRIBUTES_FUNCTION_NAME = 'getAvailableAttributes';
     public const GET_USER_ATTRIBUTES_FUNCTION_NAME = 'getUserAttributes';