diff --git a/ucs-school-umc-computerroom/umc/python/computerroom/__init__.py b/ucs-school-umc-computerroom/umc/python/computerroom/__init__.py
index 4ae829e8b..05a62ee4b 100644
--- a/ucs-school-umc-computerroom/umc/python/computerroom/__init__.py
+++ b/ucs-school-umc-computerroom/umc/python/computerroom/__init__.py
@@ -80,9 +80,9 @@ _ = Translation('ucs-school-umc-computerroom').translate
 ROOMDIR = '/var/cache/ucs-school-umc-computerroom'
 FN_SCREENSHOT_DENIED = _('/usr/share/ucs-school-umc-computerroom/screenshot_denied.jpg')
 FN_SCREENSHOT_NOTREADY = _('/usr/share/ucs-school-umc-computerroom/screenshot_notready.jpg')
-ROOM_DN_REGEX_TEMPLATE = r'cn=([a-zA-Z0-9_][a-zA-Z0-9. _-]+?[a-zA-Z0-9_]+?),cn={container},cn=groups,ou=(\w+?),{ldap_base}'
+ROOM_DN_REGEX_TEMPLATE = r'cn=([\w0-9_][\w0-9. _-]+?[\w0-9_]+?),cn={container},cn=groups,ou=(\w+?),{ldap_base}'
 ROOM_DN_REGEX_COMPILED = lazy_object_proxy.Proxy(lambda: re.compile(ROOM_DN_REGEX_TEMPLATE.format(
-	container=ucr.get('ucsschool/ldap/default/container/rooms', 'raeume'), ldap_base=ucr['ldap/base'])))
+	container=ucr.get('ucsschool/ldap/default/container/rooms', 'raeume'), ldap_base=ucr['ldap/base']), flags=re.U))
 
 
 def compare_dn(a, b):