diff --git a/PV_Visu/module.php b/PV_Visu/module.php
index c9b12f3..71d4ad9 100644
--- a/PV_Visu/module.php
+++ b/PV_Visu/module.php
@@ -65,7 +65,7 @@ public function GetVisualizationTile()
     /**
      * Callback aus dem HTML: Daten neu berechnen und senden
      */
-    public function RequestAction(string $Ident, $Value)
+    public function RequestAction($Ident, $Value)
     {
         if ($Ident === 'update') {
             $this->UpdateData();