Create table with utf8 charset

Hello WordPress users,

I’ve just created a new table with my plugin trough this code:

global $diensten_db_version;
$diensten_db_version = "1.0";

function diensten_install() {
    global $wpdb;
    global $diensten_db_version;

    $table_name = $wpdb->prefix . "diensten";

    $sql = "CREATE TABLE $table_name (
        id int(11) NOT NULL AUTO_INCREMENT,
        titel varchar(155) NOT NULL,
        price varchar(2) NOT NULL,
        category varchar(155) NOT NULL,
        PRIMARY KEY  (id),
        UNIQUE KEY id (id)
    ) ENGINE=MyISAM DEFAULT CHARSET=utf8;";

    require_once( ABSPATH . 'wp-admin/includes/upgrade.php');
    dbDelta( $sql );

    add_option( "diensten_db_version", $diensten_db_version);
}
    register_activation_hook( __FILE__, 'diensten_install' );

But the charset is set the latin-1.
When I copy this code directly in phpMyAdmin utf8 charset will be taken.

Why wordpress is not taking this charset?

Thanks for the help!