How to use SQL membership with transaction scope (without DTC)?

I'm trying to create a user using the SQL membership provider on SQL Express. When I use the TransactionScope it prompts to DTC with no apparent reason, how can I avoid it?
Here is my example code:
using (var ts = new TransactionScope())
{
    MembershipCreateStatus status;
    Membership.CreateUser(username, password, null, null, null, true, out status);
< ...