diff --git a/core/lib/Drupal/Core/Theme/Registry.php b/core/lib/Drupal/Core/Theme/Registry.php
index 0167a74..fc650c6 100644
--- a/core/lib/Drupal/Core/Theme/Registry.php
+++ b/core/lib/Drupal/Core/Theme/Registry.php
@@ -465,7 +465,6 @@ protected function processExtension(array &$cache, $name, $type, $theme, $path)
         if (isset($info['file'])) {
           $include_file = isset($info['path']) ? $info['path'] : $path;
           $include_file .= '/' . $info['file'];
-          include_once $this->root . '/' . $include_file;
           $result[$hook]['includes'][] = $include_file;
         }