diff --git a/services/univention-s4-connector/modules/univention/s4connector/__init__.py b/services/univention-s4-connector/modules/univention/s4connector/__init__.py
index 91a2346011..675025152e 100644
--- a/services/univention-s4-connector/modules/univention/s4connector/__init__.py
+++ b/services/univention-s4-connector/modules/univention/s4connector/__init__.py
@@ -833,7 +833,7 @@ class ucs:
 						ud.debug(ud.LDAP, ud.PROCESS, "__sync_file_from_ucs: Object with entryUUID %s has been removed before. Don't re-create." % entryUUID)
 						return True
 			else:
-				ud.debug(ud.LDAP, ud.ERROR, "__sync_file_from_ucs: Object without entryUUID: %s", (dn,))
+				ud.debug(ud.LDAP, ud.ERROR, "__sync_file_from_ucs: Object without entryUUID: %s" % (dn,))
 				return False
 
 			if key == 'msGPO':