diff --git a/fhem/FHEM/90_at.pm b/fhem/FHEM/90_at.pm
index 43182b153..37d2c54a5 100755
--- a/fhem/FHEM/90_at.pm
+++ b/fhem/FHEM/90_at.pm
@@ -79,7 +79,7 @@ at_Define($$)
   }
   return "datespec is not allowed with + or *" if($abstime && ($rel || $rep));
 
-  my $err = perlSyntaxCheck($command, ());
+  $err = perlSyntaxCheck($command, ());
   return $err if($err);
 
   $rel = "" if(!defined($rel));