diff --git a/webapp/ldaputils.py b/webapp/ldaputils.py
index 9330bfd..a8230e2 100644
--- a/webapp/ldaputils.py
+++ b/webapp/ldaputils.py
@@ -4,7 +4,7 @@ from webapp import config
 
 def is_valid_name(name):
   """`true` if `name` is a safe ldap uid/cn"""
-  return re.match(r'^[a-zA-Z_][a-zA-Z0-9-_]*\Z', name) is not None
+  return re.match(r'^[a-zA-Z_][a-zA-Z0-9-_\.]*\Z', name) is not None
 
 def validate_name(name):
   """Raises `RuntimeError` if `name` is not a safe ldap uid/cn"""