diff --git a/theme/system/region.vars.php b/theme/system/region.vars.php
index bd3723d..7f5ba75 100644
--- a/theme/system/region.vars.php
+++ b/theme/system/region.vars.php
@@ -108,7 +108,7 @@ function bootstrap_preprocess_region(&$variables) {
 /**
  * Implements hook_theme_suggestions_HOOK_alter().
  */
-function bootstrap_theme_suggestions_page_alter(array &$suggestions, array $variables) {
+function bootstrap_theme_suggestions_region_alter(array &$suggestions, array $variables) {
   $region = $variables['region'];
   switch ($variables['region']) {
     case 'sidebar_first':