diff --git a/devel_contrib.pages.inc b/devel_contrib.pages.inc
index 0c3d438..3a6fc5a 100644
--- a/devel_contrib.pages.inc
+++ b/devel_contrib.pages.inc
@@ -109,6 +109,7 @@ function devel_contrib_permissions_info_page() {
  * Page callback for language and translation info.
  */
 function devel_contrib_language_info_page() {
+  include_once DRUPAL_ROOT . '/includes/language.inc';
   $info = array(
     'language_types_info' => t('Language types'),
     'language_negotiation_info' => t('Language negotiation'),