diff --git a/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php b/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php
index 49c4a3a..bf9e707 100644
--- a/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php
+++ b/src/Plugin/DisplayVariant/PageBlockDisplayVariant.php
@@ -117,8 +117,12 @@ class PageBlockDisplayVariant extends BlockDisplayVariant implements PluginWizar
       }
 
       $region_name = Html::getClass("block-region-$region");
-      $build[$region]['#prefix'] = '<div class="' . $region_name . '">';
-      $build[$region]['#suffix'] = '</div>';
+      $build[$region] = [
+        '#theme_wrappers' => ['region' => [
+          '#attributes' => ['class' => [$region_name]],
+          '#region' => $region,
+        ],
+      ]];
 
       /** @var \Drupal\Core\Block\BlockPluginInterface[] $blocks */
       $weight = 0;