diff --git a/core/lib/Drupal/Core/Annotation/ContextDefinition.php b/core/lib/Drupal/Core/Annotation/ContextDefinition.php
index b7c9ec2..004c95f 100644
--- a/core/lib/Drupal/Core/Annotation/ContextDefinition.php
+++ b/core/lib/Drupal/Core/Annotation/ContextDefinition.php
@@ -103,7 +103,7 @@ public function __construct(array $values) {
         $values[$key] = (string) $values[$key]->get();
       }
       else {
-        $values[$key] = NULL
+        $values[$key] = NULL;
       }
     }
     if (isset($values['class']) && !in_array('Drupal\Core\Plugin\Context\ContextDefinitionInterface', class_implements($values['class']))) {