diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
index 13cb834..7102830 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestBase.php
@@ -241,7 +241,9 @@ protected function runUpdates() {
       'required' => TRUE,
     ]]]);
 
-    $this->drupalGet($this->updateUrl);
+    // Avoid outbound language negotiation during updates.
+    // @see https://www.drupal.org/node/2555183
+    $this->drupalGet($this->updateUrl, ['language' => 'en', 'alias' => TRUE]);
     $this->clickLink(t('Continue'));
 
     // Run the update hooks.