diff --git a/apps/user_ldap/lib/Mapping/AbstractMapping.php b/apps/user_ldap/lib/Mapping/AbstractMapping.php
index fa10312a915..8568425015b 100644
--- a/apps/user_ldap/lib/Mapping/AbstractMapping.php
+++ b/apps/user_ldap/lib/Mapping/AbstractMapping.php
@@ -113,7 +113,7 @@ abstract class AbstractMapping {
 	 * @return string|false
 	 */
 	public function getDNByName($name) {
-		$dn = array_search($name, $this->cache);
+		$dn = array_search($name, $this->cache, true);
 		if ($dn === false && ($dn = $this->getXbyY('ldap_dn', 'owncloud_name', $name)) !== false) {
 			$this->cache[$dn] = $name;
 		}
@@ -370,7 +370,7 @@ abstract class AbstractMapping {
 			DELETE FROM `' . $this->getTableName() . '`
 			WHERE `owncloud_name` = ?');
 
-		$dn = array_search($name, $this->cache);
+		$dn = array_search($name, $this->cache, true);
 		if ($dn !== false) {
 			unset($this->cache[$dn]);
 		}
diff --git a/apps/user_ldap/tests/User/DeletedUsersIndexTest.php b/apps/user_ldap/tests/User/DeletedUsersIndexTest.php
index 0e77f5023d5..a4324edd322 100644
--- a/apps/user_ldap/tests/User/DeletedUsersIndexTest.php
+++ b/apps/user_ldap/tests/User/DeletedUsersIndexTest.php
@@ -75,7 +75,7 @@ class DeletedUsersIndexTest extends \Test\TestCase {
 		// ensure the different uids were used
 		foreach ($deletedUsers as $deletedUser) {
 			$this->assertTrue(in_array($deletedUser->getOCName(), $uids));
-			$i = array_search($deletedUser->getOCName(), $uids);
+			$i = array_search($deletedUser->getOCName(), $uids, true);
 			$this->assertNotFalse($i);
 			unset($uids[$i]);
 		}