Woocommerce: Losing currency in ajax call

I have a Woocommerce site that uses the Woocommerce Multilingual plugin from WPML to handle currencies. I am trying to get the cart amount in an AJAX-call, but I get wrong currency for some reason. If I use the same method (get_cart_subtotal) in a page template the correct currency is used.

Here is my very simple ajax-action:

add_action('wp_ajax_nopriv_get_cart_total', function(){
    global $woocommerce;
    echo $woocommerce->cart->get_cart_subtotal();
});

I am using:

• WooCommerce 2.5.5
• WPML Multilingual CMS 3.3.8 WooCommerce
• Multilingual 3.7.13

via Chebli Mohamed