diff --git a/Ladestation_v2/module.php b/Ladestation_v2/module.php
index b1bb32b..7032b0e 100644
--- a/Ladestation_v2/module.php
+++ b/Ladestation_v2/module.php
@@ -36,7 +36,7 @@ class Ladestation_v2 extends IPSModule
         $this->RegisterVariableBoolean("Idle", "Idle", "", 0);
         $this->RegisterVariableInteger("Aktuelle_Leistung", "Aktuelle_Leistung", "", 0);
         $this->RegisterVariableFloat("Bezogene_Energie", "Bezogene_Energie", "", 0);
-        $this->RegisterVariableString("PowerSteps", "PowerSteps", "", "[0]");
+        $this->RegisterVariableString("PowerSteps", "PowerSteps", "", '[0]');
         $this->RegisterVariableInteger("Power", "Power");
         $this->RegisterVariableBoolean("Is_Peak_Shaving", "Is_Peak_Shaving");
         $this->RegisterVariableInteger("Leistung_Delta", "Leistung_Delta", "", 0);