IQueryable is disposed after using

I have some short code that looks like this:

public static IQueryable<User> SelectFromEmployee(int employee)
{
    using (var ctx = Database.AccountingContext())
    {
        return ctx.Users.Where(c => c.Employee_FK == employee);
    }
}

If i just keep this code as it is and use the result i get en exception telling me that the data is disposed. But if I do like this:

public static IEnumerable<User> SelectFromEmployee(int employee)
{
    using (var ctx = Database.AccountingContext())
    {
        return ctx.Users.Where(c => c.Employee_FK == employee).ToList();
    }
}

Everything works just fine. But my problem is that i want to use Linq Dynamic that require IQueryable. Is there any way to return a local IQueryable so i can continue working with it?