diff --git a/Puffer/module.php b/Puffer/module.php
index e4443b0..37d3485 100644
--- a/Puffer/module.php
+++ b/Puffer/module.php
@@ -162,7 +162,7 @@ class Puffer extends IPSModule
         IPS_LogMessage("Puffer", "nach Glättung und vor AT berechnung");
 
 
-        $at = $this->ReadPropertyInteger("Aussentemp");
+        $at = GetValue($this->ReadPropertyInteger("Aussentemp"));
         $this->SetValue("Aussentemperatur", $at);
         $m = $this->GetValue("Steigung");
         $minVT = $this->ReadPropertyInteger("MinVT_Temp");  // z.B. 20