diff --git a/enrol/ldap/lib.php b/enrol/ldap/lib.php
index a806e99eaf1..42ef21fbbf0 100644
--- a/enrol/ldap/lib.php
+++ b/enrol/ldap/lib.php
@@ -720,6 +720,7 @@ class enrol_ldap_plugin extends enrol_plugin {
             $usergroups = $this->ldap_find_user_groups($extmemberuid);
             if(count($usergroups) > 0) {
                 foreach ($usergroups as $group) {
+                    $group = ldap_filter_addslashes($group);
                     $ldap_search_pattern .= '('.$this->get_config('memberattribute_role'.$role->id).'='.$group.')';
                 }
             }