diff --git a/core/modules/block/block.module b/core/modules/block/block.module
index 1c34d22..1ea5c49 100644
--- a/core/modules/block/block.module
+++ b/core/modules/block/block.module
@@ -570,6 +570,7 @@ function template_preprocess_block(&$variables) {
   $variables['block'] = (object) array_merge($variables['elements']['#block']->getDefinition(), $variables['elements']['#block']->getConfig());
   // If the block title is configured to be hidden, set it to an empty string.
   if (empty($variables['block']->display_title)) {
+    $variables['block']->hidden_title = $variables['block']->subject;
     $variables['block']->subject = '';
   }
   if (!empty($variables['elements']['#title']) && empty($variables['block']->subject)) {
diff --git a/core/modules/block/lib/Drupal/block/BlockBase.php b/core/modules/block/lib/Drupal/block/BlockBase.php
index 2c73b8d..1da997a 100644
--- a/core/modules/block/lib/Drupal/block/BlockBase.php
+++ b/core/modules/block/lib/Drupal/block/BlockBase.php
@@ -33,6 +33,7 @@ public function settings() {
     $settings += array(
       'status' => TRUE,
       'cache' => DRUPAL_NO_CACHE,
+      'display_title' => TRUE,
     );
     return $settings;
   }