diff --git a/core/lib/Drupal/Core/Block/Plugin/Block/PageTitleBlock.php b/core/lib/Drupal/Core/Block/Plugin/Block/PageTitleBlock.php
index c70c272..4589973 100644
--- a/core/lib/Drupal/Core/Block/Plugin/Block/PageTitleBlock.php
+++ b/core/lib/Drupal/Core/Block/Plugin/Block/PageTitleBlock.php
@@ -11,7 +11,6 @@
  * @Block(
  *   id = "page_title_block",
  *   admin_label = @Translation("Page title"),
- *   category = @Translation("System")
  * )
  */
 class PageTitleBlock extends BlockBase implements TitleBlockPluginInterface {
diff --git a/core/tests/Drupal/Tests/Core/Plugin/CategorizingPluginManagerTraitTest.php b/core/tests/Drupal/Tests/Core/Plugin/CategorizingPluginManagerTraitTest.php
index db67ad7..c1a3c43 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/CategorizingPluginManagerTraitTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/CategorizingPluginManagerTraitTest.php
@@ -90,7 +90,7 @@ public function testProcessDefinitionCategory() {
       'provider' => 'core',
     ];
     $this->pluginManager->processDefinition($definition, 'some');
-    $this->assertSame($definition['category'], 'core');
+    $this->assertSame($definition['category']->getUntranslatedString(), 'core');
 
     // No category, provider is module with label.
     $definition = [
@@ -98,7 +98,7 @@ public function testProcessDefinitionCategory() {
       'provider' => 'node',
     ];
     $this->pluginManager->processDefinition($definition, 'some');
-    $this->assertSame($definition['category'], 'Node');
+    $this->assertSame($definition['category']->getUntranslatedString(), 'Node');
   }
 
 }