diff --git a/core/modules/language/lib/Drupal/language/Tests/LanguageSwitchingTest.php b/core/modules/language/lib/Drupal/language/Tests/LanguageSwitchingTest.php
index 826fcf9..b4c4616 100644
--- a/core/modules/language/lib/Drupal/language/Tests/LanguageSwitchingTest.php
+++ b/core/modules/language/lib/Drupal/language/Tests/LanguageSwitchingTest.php
@@ -42,8 +42,12 @@ function setUp() {
    * Functional tests for the language switcher block.
    */
   function testLanguageBlock() {
-    // Enable the language switching block.
-    $block = $this->drupalPlaceBlock('language_block:' . Language::TYPE_INTERFACE, array('id' => 'test_language_block'));
+    // Enable the language switching block..
+    $block = $this->drupalPlaceBlock('language_block:' . Language::TYPE_INTERFACE, array(
+      'id' => 'test_language_block',
+      // Ensure a 2-byte UTF-8 sequence is in the tested output.
+      'label' => $this->randomName(8) . '×',
+    ));
 
     // Add language.
     $edit = array(