diff --git a/core/modules/views/lib/Drupal/views/Plugin/Core/Entity/View.php b/core/modules/views/lib/Drupal/views/Plugin/Core/Entity/View.php
index 924cfa5..2ace2aa 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/Core/Entity/View.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/Core/Entity/View.php
@@ -222,7 +222,7 @@ public function addDisplay($plugin_id = 'page', $title = NULL, $id = NULL) {
       'display_plugin' => $plugin_id,
       'id' => $id,
       'display_title' => $title,
-      'position' => NULL,
+      'position' => count($this->display),
       'display_options' => array(),
     );
 
diff --git a/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayTest.php b/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayTest.php
index 4ccd11d..426be52 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Plugin/DisplayTest.php
@@ -70,7 +70,7 @@ function testDisplayPlugin() {
       'display_plugin' => 'display_test',
       'id' => 'display_test_1',
       'display_title' => 'Display test',
-      'position' => NULL,
+      'position' => 1,
     );
     $this->assertEqual($displays['display_test_1'], $options);