diff --git a/page_manager_ui/src/Form/PageGeneralForm.php b/page_manager_ui/src/Form/PageGeneralForm.php
index 5890748..a86073d 100644
--- a/page_manager_ui/src/Form/PageGeneralForm.php
+++ b/page_manager_ui/src/Form/PageGeneralForm.php
@@ -89,6 +89,14 @@ class PageGeneralForm extends FormBase {
     if ($page->isNew()) {
       $variant_plugin_options = [];
       foreach ($this->variantManager->getDefinitions() as $plugin_id => $definition) {
+        // The following two variants are provided by Drupal Core. They are not
+        // configurable and therefore not compatible with Page Manager but have
+        // similar and confusing labels. Skip them so that they are not shown in
+        // the UI.
+        if (in_array($plugin_id, ['simple_page', 'block_page'])) {
+          continue;
+        }
+
         $variant_plugin_options[$plugin_id] = $definition['admin_label'];
       }
       $form['variant_plugin_id'] = [