diff --git a/fhem/FHEM/70_STV.pm b/fhem/FHEM/70_STV.pm
index ace0c24ff..705bf2a2c 100644
--- a/fhem/FHEM/70_STV.pm
+++ b/fhem/FHEM/70_STV.pm
@@ -661,7 +661,7 @@ sub STV_Set($@)
     }
     return $ret;
   }
-  return $undef;
+  return undef;
 }
 
 1;