diff --git a/app/code/community/OpenTools/Ordernumber/Model/Ordernumber.php b/app/code/community/OpenTools/Ordernumber/Model/Ordernumber.php
index a162d93ef25451670aff18df4edccfebac6ab600..0bb3c565e7343bc16fe3e52d804e7f73a318f1fc 100644
--- a/app/code/community/OpenTools/Ordernumber/Model/Ordernumber.php
+++ b/app/code/community/OpenTools/Ordernumber/Model/Ordernumber.php
@@ -45,7 +45,8 @@ $helper->logitem("Saved counter: ", $res);
     }
     public function readableType($type)
     {
-        return $this->getNumberTypes()[$type];
+		$types = $this->getNumberTypes();
+        return $types[$type];
     }
 
     public function readableScope($scope)