diff --git a/includes/bootstrap.inc b/includes/bootstrap.inc
index f6af071..b9e3d02 100644
--- a/includes/bootstrap.inc
+++ b/includes/bootstrap.inc
@@ -2397,7 +2397,7 @@ function drupal_get_schema($table = NULL, $rebuild = FALSE) {
         module_load_all_includes('install');
       }
 
-      require_once DRUPAL_ROOT . '/includes/common.inc';
+      require_once DRUPAL_ROOT . '/' . variable_get('common_inc', 'includes/common.inc');
       // Invoke hook_schema for all modules.
       foreach (module_implements('schema') as $module) {
         // Cast the result of hook_schema() to an array, as a NULL return value
diff --git a/includes/common.inc b/includes/common.inc
index 6ee62bb..b31046f 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -4405,7 +4405,7 @@ function _drupal_bootstrap_full() {
   require_once DRUPAL_ROOT . '/' . variable_get('path_inc', 'includes/path.inc');
   require_once DRUPAL_ROOT . '/includes/theme.inc';
   require_once DRUPAL_ROOT . '/includes/pager.inc';
-  require_once DRUPAL_ROOT . '/' . variable_get('menu_inc', '/includes/menu.inc');
+  require_once DRUPAL_ROOT . '/' . variable_get('menu_inc', 'includes/menu.inc');
   require_once DRUPAL_ROOT . '/includes/tablesort.inc';
   require_once DRUPAL_ROOT . '/includes/file.inc';
   require_once DRUPAL_ROOT . '/includes/unicode.inc';