diff --git a/core/modules/help/lib/Drupal/help/Tests/HelpTest.php b/core/modules/help/lib/Drupal/help/Tests/HelpTest.php
index dd21f0e..4538c9d 100644
--- a/core/modules/help/lib/Drupal/help/Tests/HelpTest.php
+++ b/core/modules/help/lib/Drupal/help/Tests/HelpTest.php
@@ -64,10 +64,16 @@ public function testHelp() {
     $this->drupalLogin($this->anyUser);
     $this->verifyHelp(403);
 
+    // Disable css aggregation so we can check if help.css exists.
+    $system_performance = config('system.performance');
+    $css_preprocess = $system_performance->get('css.preprocess');
+    $system_performance->set('css.preprocess', 0)->save();
     // Check for css on admin/help.
     $this->drupalLogin($this->adminUser);
     $this->drupalGet('admin/help');
     $this->assertRaw(drupal_get_path('module', 'help') . '/css/help.module.css', 'The help.module.css file is present in the HTML.');
+    // Restore css aggregation setting.
+    $system_performance->set('css.preprocess', $css_preprocess)->save();
 
     // Verify that introductory help text exists, goes for 100% module coverage.
     $this->assertRaw(t('For more information, refer to the subjects listed in the Help Topics section or to the <a href="!docs">online documentation</a> and <a href="!support">support</a> pages at <a href="!drupal">drupal.org</a>.', array('!docs' => 'https://drupal.org/documentation', '!support' => 'https://drupal.org/support', '!drupal' => 'https://drupal.org')), 'Help intro text correctly appears.');
diff --git a/core/profiles/standard/config/system.performance.yml b/core/profiles/standard/config/system.performance.yml
new file mode 100644
index 0000000..103d6e4
--- /dev/null
+++ b/core/profiles/standard/config/system.performance.yml
@@ -0,0 +1,4 @@
+css:
+  preprocess: 1
+js:
+  preprocess: 1