diff --git a/lib/authentication/authenticationprovider.inc.php b/lib/authentication/authenticationprovider.inc.php
index a279891..b18a3e0 100644
--- a/lib/authentication/authenticationprovider.inc.php
+++ b/lib/authentication/authenticationprovider.inc.php
@@ -13,8 +13,9 @@ class KTAuthenticationProvider extends KTStandardDispatcher {
         $this->aInfo = $aInfo;
     }
 
-    function &getAuthenticator() {
-        return $this;
+    function &getAuthenticator($oSource) {
+        // Not implemented
+        return null;
     }
 
     function &getSource() {