diff --git a/core/includes/update.inc b/core/includes/update.inc
index ec21acaf6af221c0eeb2e0e3c4befab17253bc62..7ba190317f5faf5d9872e8d89e3921aa3325a4d7 100644
--- a/core/includes/update.inc
+++ b/core/includes/update.inc
@@ -88,6 +88,7 @@ function update_check_incompatibility($name, $type = 'module') {
  */
 function update_prepare_d8_bootstrap() {
   include_once DRUPAL_ROOT . '/core/includes/install.inc';
+  include_once DRUPAL_ROOT . '/core/includes/schema.inc';
   // Bootstrap to configuration.
   drupal_bootstrap(DRUPAL_BOOTSTRAP_CONFIGURATION);