diff --git a/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php b/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php
index 10438c1..38373aa 100644
--- a/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php
+++ b/core/tests/Drupal/Tests/Core/Template/TwigExtensionTest.php
@@ -320,7 +320,7 @@ public function testCreateAttribute() {
     $expected = '<div class="kittens" data-toggle="modal" data-lang="es"></div><div id="puppies" data-value="foo" data-lang="en"></div><div></div>';
     $this->assertEquals($expected, $result);
 
-    // Test default creation of empty attribute object and using it's method.
+    // Test default creation of empty attribute object and using its method.
     $result = $twig->render("<div{{ create_attribute().addClass('meow') }}></div>");
     $expected = '<div class="meow"></div>';
     $this->assertEquals($expected, $result);