diff --git a/src/mibew/libs/classes/Mibew/Controller/ButtonCodeController.php b/src/mibew/libs/classes/Mibew/Controller/ButtonCodeController.php
index cdf9cb6a..23146cef 100644
--- a/src/mibew/libs/classes/Mibew/Controller/ButtonCodeController.php
+++ b/src/mibew/libs/classes/Mibew/Controller/ButtonCodeController.php
@@ -342,7 +342,7 @@ class ButtonCodeController extends AbstractController
      * @return array The keys of the resulting array are images names and the
      *   values are arrays of locales which contains the image.
      */
-    function getImageLocalesMap($locales_dir)
+    protected function getImageLocalesMap($locales_dir)
     {
         $image_locales = array();
         $all_locales = get_available_locales();