diff --git a/core/modules/system/src/Tests/Cache/AssertPageCacheTagsTrait.php b/core/modules/system/src/Tests/Cache/AssertPageCacheTagsTrait.php
index bfed1df..86192ed 100644
--- a/core/modules/system/src/Tests/Cache/AssertPageCacheTagsTrait.php
+++ b/core/modules/system/src/Tests/Cache/AssertPageCacheTagsTrait.php
@@ -35,6 +35,7 @@ protected function enablePageCaching() {
    *   The expected cache tags for the page cache entry of the given $path.
    */
   protected function assertPageCacheTags(Url $url, $expected_tags) {
+    sort($expected_tags);
     $this->drupalGet($url->setAbsolute()->toString());
     $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
     $actual_tags = explode(' ', $this->drupalGetHeader('X-Drupal-Cache-Tags'));