diff --git a/ipalib/plugins/service.py b/ipalib/plugins/service.py
index 7c563b306..333d5bbf3 100644
--- a/ipalib/plugins/service.py
+++ b/ipalib/plugins/service.py
@@ -208,7 +208,7 @@ def check_required_principal(ldap, hostname, service):
     try:
         host_is_master(ldap, hostname)
     except errors.ValidationError, e:
-        service_types = ['HTTP', 'ldap', 'DNS' 'dogtagldap']
+        service_types = ['HTTP', 'ldap', 'DNS', 'dogtagldap']
         if service in service_types:
             raise errors.ValidationError(name='principal', error=_('This principal is required by the IPA master'))