diff --git a/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php b/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php
index aa57dec..4511346 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Common/FormatDateTest.php
@@ -56,6 +56,7 @@ function setUp() {
 
     $language = new Language(array('id' => static::LANGCODE));
     language_save($language);
+    $this->resetAll();
   }
 
   /**
diff --git a/core/modules/system/lib/Drupal/system/Tests/System/PageTitleTest.php b/core/modules/system/lib/Drupal/system/Tests/System/PageTitleTest.php
index b22fd90..d08817d 100644
--- a/core/modules/system/lib/Drupal/system/Tests/System/PageTitleTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/System/PageTitleTest.php
@@ -150,9 +150,10 @@ public function testRoutingTitle() {
     $this->assertEqual('Test dynamic title', (string) $result[0]);
 
     // Set some custom translated strings.
-    variable_set('locale_custom_strings_en', array('' => array(
+    $this->addCustomTranslations('en', array('' => array(
       'Static title' => 'Static title translated'
     )));
+    $this->writeCustomTranslations();
 
     // Ensure that the title got translated.
     $this->drupalGet('test-page-static-title');