diff --git a/core/modules/image/lib/Drupal/image/Tests/ImageEffectsTest.php b/core/modules/image/lib/Drupal/image/Tests/ImageEffectsTest.php
index f01b786..c693b7e 100644
--- a/core/modules/image/lib/Drupal/image/Tests/ImageEffectsTest.php
+++ b/core/modules/image/lib/Drupal/image/Tests/ImageEffectsTest.php
@@ -157,7 +157,7 @@ function testParameterEffect() {
     $this->assertImageEffect('image_module_test_parameter', array());
 
     // Check that the effect has set the test parameter.
-    $this->assertEqual($style->getParameter('test_parameter'), 'test_value', 'Style parameter was set correctly by the effect');
+    $this->assertEqual($this->style->getParameter('test_parameter'), 'test_value', 'Style parameter was set correctly by the effect');
   }
 
   /**