diff --git a/.travis.yml b/.travis.yml
index 91dcfa03fa..62754a68af 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,14 +32,16 @@ env:
 
 before_install:
     - if [[ "$deps" = "no" ]] && [[ "$TRAVIS_PHP_VERSION" =~ 5.[45] ]] && [[ "$TRAVIS_PULL_REQUEST" != "false" ]]; then export deps=skip; fi;
+    - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" ]]; then INI_FILE=~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; else INI_FILE=/etc/hhvm/php.ini; fi;
+    - echo "memory_limit = -1" >> $INI_FILE
+    - echo "session.gc_probability = 0" >> $INI_FILE
     - if [ "$deps" != "skip" ]; then composer self-update; fi;
-    - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" ]]; then echo "memory_limit = -1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini; fi;
     - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then phpenv config-rm xdebug.ini; fi;
-    - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then echo "extension = mongo.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;
-    - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then echo "extension = memcache.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini; fi;
-    - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then (echo yes | pecl install -f apcu-4.0.7 && echo "apc.enable_cli = 1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini) || echo "Let's continue without apcu extension"; fi;
+    - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then echo "extension = mongo.so" >> $INI_FILE; fi;
+    - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then echo "extension = memcache.so" >> $INI_FILE; fi;
+    - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then (echo yes | pecl install -f apcu-4.0.7 && echo "apc.enable_cli = 1" >> $INI_FILE) || echo "Let's continue without apcu extension"; fi;
     - if [[ "$TRAVIS_PHP_VERSION" = 5.* ]]; then pecl install -f memcached-2.1.0 || echo "Let's continue without memcached extension"; fi;
-    - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" ]]; then php -i; fi;
+    - if [[ "$TRAVIS_PHP_VERSION" != "hhvm" ]]; then php -i; else hhvm --php -r 'print_r($_SERVER);print_r(ini_get_all());'; fi;
     - if [ "$deps" != "skip" ]; then ./phpunit install; fi;
     - export PHPUNIT="$(readlink -f ./phpunit)"
 
diff --git a/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php b/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php
index e569accac4..26cac94156 100644
--- a/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/Fragment/FragmentHandlerTest.php
@@ -14,12 +14,20 @@ namespace Symfony\Component\HttpKernel\Tests\Fragment;
 use Symfony\Component\HttpKernel\Fragment\FragmentHandler;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Bridge\PhpUnit\ClockMock;
 
 /**
  * @group time-sensitive
  */
 class FragmentHandlerTest extends \PHPUnit_Framework_TestCase
 {
+    protected function setUp()
+    {
+        if (class_exists('Symfony\Bridge\PhpUnit\ClockMock')) {
+            ClockMock::register('Symfony\Component\HttpFoundation\Request');
+        }
+    }
+
     /**
      * @expectedException \InvalidArgumentException
      */