function custom_single_product_image_html( $html, $post_id ) { $post_thumbnail_id = get_post_thumbnail_id( $post_id ); return get_the_post_thumbnail( $post_thumbnail_id, apply_filters( 'single_product_large_thumbnail_size', 'shop_single' ) ); } add_filter('woocommerce_single_product_image_thumbnail_html', 'custom_single_product_image_html', 10, 2);