diff --git a/PVE/API2/Ceph.pm b/PVE/API2/Ceph.pm
index f262be57..8ee46101 100644
--- a/PVE/API2/Ceph.pm
+++ b/PVE/API2/Ceph.pm
@@ -1179,7 +1179,7 @@ __PACKAGE__->register_method ({
 			 '--', $param->{dev}]);
 	};
 
-	return $rpcenv->fork_worker('cephcreateosd', $param->{dev},  $authuser, $worker);
+	return $rpcenv->fork_worker('cephcreateosd', $devname,  $authuser, $worker);
     }});
 
 __PACKAGE__->register_method ({