diff --git a/core/modules/block/lib/Drupal/block/Plugin/Type/BlockManager.php b/core/modules/block/lib/Drupal/block/Plugin/Type/BlockManager.php
index f5de484..5430c2b 100644
--- a/core/modules/block/lib/Drupal/block/Plugin/Type/BlockManager.php
+++ b/core/modules/block/lib/Drupal/block/Plugin/Type/BlockManager.php
@@ -23,7 +23,7 @@ class BlockManager extends PluginManagerBase {
    */
   public function __construct() {
     $this->discovery = new AnnotatedClassDiscovery('block', 'block');
-    $this->discovery = new DerivativeDiscoveryDecorator($this->discovery)
+    $this->discovery = new DerivativeDiscoveryDecorator($this->discovery);
     $this->discovery = new AlterDecorator($this->discovery, 'block');
     $this->factory = new DefaultFactory($this);
     $this->mapper = new ConfigMapper($this);