diff --git a/index.php b/index.php
index 993554a..f80fdca 100644
--- a/index.php
+++ b/index.php
@@ -18,6 +18,8 @@ if (is_file(__DIR__ . '/vendor/autoload.php')) {
     die("Cannot find 'vendor/autoload.php'. Run `composer install`.");
 }
 
+setlocale(LC_ALL, "de_DE@euro", 'de_DE', 'deu_deu');
+
 // instance Pico
 $pico = new Pico(
     __DIR__,    // root dir