diff --git a/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php b/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
index 2656ccf..7d11933 100644
--- a/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
+++ b/core/modules/system/src/Tests/Render/HtmlResponseAttachmentsTest.php
@@ -60,7 +60,7 @@ public function testAttachments() {
     $this->drupalGet('/render_attached_test/head');
     $this->assertHeader('X-Drupal-Cache', 'HIT');
 
-    // Now repeat all of the preceeding using drupal_process_attached().
+    // Now repeat all of the preceding using drupal_process_attached().
     // Test ['#attached']['http_header] = ['Status', $code].
     $this->drupalGet('/render_attached_test/teapot_dpa');
     $this->assertResponse(418);
diff --git a/core/modules/system/tests/modules/render_attached_test/src/Controller/TestController.php b/core/modules/system/tests/modules/render_attached_test/src/Controller/TestController.php
index 8e71bf0..1d08543 100644
--- a/core/modules/system/tests/modules/render_attached_test/src/Controller/TestController.php
+++ b/core/modules/system/tests/modules/render_attached_test/src/Controller/TestController.php
@@ -81,7 +81,7 @@ public function feed() {
    *   A generic render array.
    */
   public function teapotHeaderStatusDpa() {
-    \drupal_process_attached($this->teapotHeaderStatus());
+    drupal_process_attached($this->teapotHeaderStatus());
     return ['#markup' => "I'm some markup here to fool the kernel into rendering this page."];
   }
 
@@ -92,7 +92,7 @@ public function teapotHeaderStatusDpa() {
    *   A render array using the 'http_header' directive.
    */
   public function headerDpa() {
-    \drupal_process_attached($this->header());
+    drupal_process_attached($this->header());
     return ['#markup' => "I'm some markup here to fool the kernel into rendering this page."];
   }
 
@@ -103,7 +103,7 @@ public function headerDpa() {
    *   A render array using the 'html_head' directive.
    */
   public function headDpa() {
-    \drupal_process_attached($this->head());
+    drupal_process_attached($this->head());
     return ['#markup' => "I'm some markup here to fool the kernel into rendering this page."];
   }
 
@@ -114,7 +114,7 @@ public function headDpa() {
    *   A render array using the 'feed' directive.
    */
   public function feedDpa() {
-    \drupal_process_attached($this->feed());
+    drupal_process_attached($this->feed());
     return ['#markup' => "I'm some markup here to fool the kernel into rendering this page."];
   }