diff --git a/src/Symfony/Component/Ldap/Tests/Adapter/ExtLdap/AdapterTest.php b/src/Symfony/Component/Ldap/Tests/Adapter/ExtLdap/AdapterTest.php
index 5607cdd437603..a6a6031a79081 100644
--- a/src/Symfony/Component/Ldap/Tests/Adapter/ExtLdap/AdapterTest.php
+++ b/src/Symfony/Component/Ldap/Tests/Adapter/ExtLdap/AdapterTest.php
@@ -39,7 +39,7 @@ public function testLdapEscape()
      */
     public function testSaslBind()
     {
-        $h = @ldap_connect(getenv('LDAP_HOST'), getenv('LDAP_PORT'));
+        $h = @ldap_connect('ldap://'.getenv('LDAP_HOST').':'.getenv('LDAP_PORT'));
         @ldap_set_option($h, \LDAP_OPT_PROTOCOL_VERSION, 3);
 
         if (!$h || !@ldap_bind($h)) {