Add SKU to Woocommerce custom post type URL

This is what I need:

http://ift.tt/1zCpiTm

With the code I found here, I do get the following solution:

http://ift.tt/14fucxR

Anybody has an idea how to remove the slash between postname and sku?

    function append_sku_string( $link, $post ) {
  $post_meta = get_post_meta( $post->ID, '_sku', true );
      if ( 'product' == get_post_type( $post ) ) {
        $link = $link . '#' .$post_meta;
        return $link;
     }
}
add_filter( 'post_type_link', 'append_sku_string', 1, 2 );