Add category class to body for single portfolio items

Hello, i need to add the Portfolio category as a body class on single portfolio pages. 
I added the following code below to add the categories on blogpost:

add_filter('body_class','add_category_to_single');
  function add_category_to_single($classes) {
    if (is_single() ) {
      global $post;
      foreach((get_the_category($post->ID)) as $category) {
        // add category slug to the $classes array
        $classes[] = $category->category_nicename;
      }
    }
    // return the $classes array
    return $classes;
  }


But I can't adapt to the Portfolio. Please advise as to how to get this working for portfolio single pages.

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