diff --git a/apps/user_ldap/lib_ldap.php b/apps/user_ldap/lib_ldap.php
index bd3dbe9534..614c6d916f 100644
--- a/apps/user_ldap/lib_ldap.php
+++ b/apps/user_ldap/lib_ldap.php
@@ -524,6 +524,9 @@ class OC_LDAP {
 		//OID sometimes gives back DNs with whitespace after the comma a la "uid=foo, cn=bar, dn=..." We need to tackle this!
 		$dn = preg_replace('/,\s+/',',',$dn);
 
+		//make comparisons and everything work
+		$dn = strtolower($dn);
+
 		return $dn;
 	}