diff --git a/apps/user_ldap/lib_ldap.php b/apps/user_ldap/lib_ldap.php
index f6942ad326e..6f4c0b0aad9 100644
--- a/apps/user_ldap/lib_ldap.php
+++ b/apps/user_ldap/lib_ldap.php
@@ -258,7 +258,7 @@ class OC_LDAP {
 			$key = self::recursiveArraySearch($knownObjects, $ldapObject['dn']);
 
 			//everything is fine when we know the group
-			if($key) {
+			if($key !== false) {
 				$ownCloudNames[] = $knownObjects[$key]['owncloud_name'];
 				continue;
 			}