diff --git a/src/includes/routes.php b/src/includes/routes.php
index 169a7382..966946f1 100644
--- a/src/includes/routes.php
+++ b/src/includes/routes.php
@@ -311,11 +311,12 @@ LSurl :: add_handler('#^favicon\.ico#', 'handle_favicon_ico_view', false, true,
 function handle_libs_file($request) {
   $path = LStemplate :: getLibFilePath($request -> file);
   if ($path  && is_file($path)) {
-    switch (strtolower(substr($path, -4))) {
-      case '.css':
+    $info = new SplFileInfo($path);
+    switch ($info -> getExtension()) {
+      case 'css':
         $mime_type = 'text/css';
         break;
-      case '.js':
+      case 'js':
         $mime_type = 'text/javascript';
         break;
       default: