diff --git a/src/EventSubscriber/BlockPageDisplayVariantSubscriber.php b/src/EventSubscriber/BlockPageDisplayVariantSubscriber.php
index 536ab11..2b5d785 100644
--- a/src/EventSubscriber/BlockPageDisplayVariantSubscriber.php
+++ b/src/EventSubscriber/BlockPageDisplayVariantSubscriber.php
@@ -23,8 +23,8 @@ class BlockPageDisplayVariantSubscriber implements EventSubscriberInterface {
    *   The event to process.
    */
   public function onSelectPageDisplayVariant(PageDisplayVariantSelectionEvent $event) {
-    // Determine a better way to check for a page manager route.
-    if (strpos($event->getRouteMatch()->getRouteName(), 'page_manager.page_view_') === 0) {
+    if ($page_manager = $event->getRouteMatch()->getParameter('page_manager_page')) {
+      // @todo Check the page entity for the setting about disabling blocks.
       $event->setPluginId('simple_page');
     }
   }