diff --git a/lib/redmine/wiki_formatting/textile/helper.rb b/lib/redmine/wiki_formatting/textile/helper.rb
index 397206b5a..77cb90c67 100644
--- a/lib/redmine/wiki_formatting/textile/helper.rb
+++ b/lib/redmine/wiki_formatting/textile/helper.rb
@@ -29,7 +29,7 @@ module Redmine
       
           javascript_include_tag('jstoolbar/jstoolbar') +
             javascript_include_tag('jstoolbar/textile') +
-            javascript_include_tag("jstoolbar/lang/jstoolbar-#{current_language}") +
+            javascript_include_tag("jstoolbar/lang/jstoolbar-#{current_language.to_s.downcase}") +
           javascript_tag("var wikiToolbar = new jsToolBar($('#{field_id}')); wikiToolbar.setHelpLink('#{help_link}'); wikiToolbar.draw();")
         end