diff --git a/.travis.yml b/.travis.yml
index 127a3b5fa3cc8..8e22e1323ff0d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -37,6 +37,8 @@ services:
     - redis-server
 
 before_install:
+    - mkdir /tmp/slapd
+    - slapd -f src/Symfony/Component/Ldap/Tests/Fixtures/conf/slapd.conf -h ldap://localhost:3389 &
     # Matrix lines for intermediate PHP versions are skipped for pull requests
     - if [[ ! $deps && ! $TRAVIS_PHP_VERSION = ${MIN_PHP%.*} && $TRAVIS_PHP_VERSION != hhvm && $TRAVIS_PULL_REQUEST != false ]]; then deps=skip; fi;
     # A sigchild-enabled-PHP is used to test the Process component on the lowest PHP matrix line
@@ -57,9 +59,6 @@ before_install:
     - if [[ $deps != skip && $TRAVIS_REPO_SLUG = symfony/symfony ]]; then cp .composer/* ~/.composer/; composer global install; fi;
     - if [[ $deps != skip ]]; then ./phpunit install; fi;
     - export PHPUNIT=$(readlink -f ./phpunit)
-    - mkdir /tmp/slapd
-    - slapd -f src/Symfony/Component/Ldap/Tests/Fixtures/conf/slapd.conf -h ldap://localhost:3389 &
-    - sleep 3
     - ldapadd -h localhost:3389 -D cn=admin,dc=symfony,dc=com -w symfony -f src/Symfony/Component/Ldap/Tests/Fixtures/data/base.ldif
     - ldapadd -h localhost:3389 -D cn=admin,dc=symfony,dc=com -w symfony -f src/Symfony/Component/Ldap/Tests/Fixtures/data/fixtures.ldif
 
diff --git a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
index efd17102923a7..390c4909dcc02 100644
--- a/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
+++ b/src/Symfony/Bridge/PhpUnit/DeprecationErrorHandler.php
@@ -19,6 +19,7 @@
 class DeprecationErrorHandler
 {
     const MODE_WEAK = 'weak';
+    const MODE_DISABLED = 'disabled';
 
     private static $isRegistered = false;
 
@@ -67,11 +68,10 @@ public static function register($mode = 0)
             'other' => array(),
         );
         $deprecationHandler = function ($type, $msg, $file, $line, $context) use (&$deprecations, $getMode) {
-            if (E_USER_DEPRECATED !== $type) {
+            if (E_USER_DEPRECATED !== $type || DeprecationErrorHandler::MODE_DISABLED === $mode = $getMode()) {
                 return \PHPUnit_Util_ErrorHandler::handleError($type, $msg, $file, $line, $context);
             }
 
-            $mode = $getMode();
             $trace = debug_backtrace(true);
             $group = 'other';
 
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/disabled.phpt b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/disabled.phpt
new file mode 100644
index 0000000000000..0115bbd24259a
--- /dev/null
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DeprecationErrorHandler/disabled.phpt
@@ -0,0 +1,24 @@
+--TEST--
+Test DeprecationErrorHandler in weak mode
+--FILE--
+<?php
+
+putenv('SYMFONY_DEPRECATIONS_HELPER=disabled');
+putenv('ANSICON');
+putenv('ConEmuANSI');
+putenv('TERM');
+
+$vendor = __DIR__;
+while (!file_exists($vendor.'/vendor')) {
+    $vendor = dirname($vendor);
+}
+define('PHPUNIT_COMPOSER_INSTALL', $vendor.'/vendor/autoload.php');
+require PHPUNIT_COMPOSER_INSTALL;
+require_once __DIR__.'/../../bootstrap.php';
+
+echo (int) set_error_handler('var_dump');
+echo (int) class_exists('Symfony\Bridge\PhpUnit\DeprecationErrorHandler', false);
+
+?>
+--EXPECTF--
+00
diff --git a/src/Symfony/Bridge/PhpUnit/Tests/DnsMockTest.php b/src/Symfony/Bridge/PhpUnit/Tests/DnsMockTest.php
index 8da1283324a44..034d07a30f67a 100644
--- a/src/Symfony/Bridge/PhpUnit/Tests/DnsMockTest.php
+++ b/src/Symfony/Bridge/PhpUnit/Tests/DnsMockTest.php
@@ -13,8 +13,6 @@
 
 use Symfony\Bridge\PhpUnit\DnsMock;
 
-require_once __DIR__.'/../DnsMock.php';
-
 class DnsMockTest extends \PHPUnit_Framework_TestCase
 {
     protected function tearDown()
diff --git a/src/Symfony/Bridge/PhpUnit/bootstrap.php b/src/Symfony/Bridge/PhpUnit/bootstrap.php
index 1283da08fa408..5e2ed0ca85f82 100644
--- a/src/Symfony/Bridge/PhpUnit/bootstrap.php
+++ b/src/Symfony/Bridge/PhpUnit/bootstrap.php
@@ -24,4 +24,6 @@
     AnnotationRegistry::registerLoader('class_exists');
 }
 
-DeprecationErrorHandler::register(getenv('SYMFONY_DEPRECATIONS_HELPER'));
+if ('disabled' !== getenv('SYMFONY_DEPRECATIONS_HELPER')) {
+    DeprecationErrorHandler::register(getenv('SYMFONY_DEPRECATIONS_HELPER'));
+}

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