diff --git a/ucs-4.0-2/management/univention-directory-manager-modules/modules/univention/admincli/admin.py b/ucs-4.0-2/management/univention-directory-manager-modules/modules/univention/admincli/admin.py
index d309378..af5bb46 100755
--- a/ucs-4.0-2/management/univention-directory-manager-modules/modules/univention/admincli/admin.py
+++ b/ucs-4.0-2/management/univention-directory-manager-modules/modules/univention/admincli/admin.py
@@ -46,6 +46,7 @@
 import univention.admin.modules
 import univention.admin.objects
 from univention.admin.layout import Tab, Group
+from univention.admin.syntax import ldapFilter
 import univention.config_registry
 import univention.admin.ipaddress
 
@@ -507,6 +508,7 @@ def _doit(arglist):
 		elif opt == '--append-option':
 			parsed_append_options.append(val)
 		elif opt == '--filter':
+			ldapFilter.parse(val)
 			filter=val
 		elif opt == '--customattribute':
 			pos=val.find('=')