diff --git a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php
index 3ff790d05181..2dcb215b921a 100644
--- a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php
+++ b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Connection.php
@@ -107,6 +107,10 @@ protected function configureOptions(OptionsResolver $resolver)
                 $value['referrals'] = $options['referrals'];
             }
 
+            if (!isset($value['network_timeout'])) {
+                $value['network_timeout'] = ini_get('default_socket_timeout');
+            }
+
             return $value;
         });