diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 7f494c5..50d78f4 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -409,12 +409,15 @@ function install_begin_request(&$install_state) {
 
   // Override the module list with a minimal set of modules.
   $module_handler = \Drupal::moduleHandler();
-  $module_list = $module_handler->getModuleList();
-  if (!$module_handler->moduleExists('system')) {
-    $module_list['system'] = 'core/modules/system/system.module';
-    system_register('module', 'system', $module_list['system']);
-  }
-  if ($profile && !$module_handler->moduleExists($profile)) {
+  $original_module_list = $module_handler->getModuleList();
+  $module_list = array();
+  $module_list['system'] = 'core/modules/system/system.module';
+  system_register('module', 'system', $module_list['system']);
+  if (isset($original_module_list['user'])) {
+    $module_list['user'] = 'core/modules/user/user.module';
+    system_register('module', 'user', $module_list['user']);
+  }
+  if ($profile) {
     $module_list[$profile] = $install_state['profiles'][$profile]->uri;
     system_register('profile', $profile, $module_list[$profile]);
   }