diff --git a/core/tests/Drupal/KernelTests/Core/Extension/ExtensionUnserializedServiceAppRootUsageTest.php b/core/tests/Drupal/KernelTests/Core/Extension/ExtensionUnserializedServiceAppRootUsageTest.php
index f32463e687..fca9d0c1c9 100644
--- a/core/tests/Drupal/KernelTests/Core/Extension/ExtensionUnserializedServiceAppRootUsageTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Extension/ExtensionUnserializedServiceAppRootUsageTest.php
@@ -49,7 +49,7 @@ protected function setUp() {
   public function testServiceAppRouteUsage() {
     $data = $this->extension->serialize();
     $this->extension->unserialize($data);
-    self::assertEquals($this->dummyAppRoot, $this->readAttribute($this->extension, 'root'));
+    $this->assertEquals($this->dummyAppRoot, $this->readAttribute($this->extension, 'root'));
   }
 
 }