C# - Can't Access Master Page From User Control

My master page code looks something like this:

namespace Recipes
{
public partial class MasterPage : System.Web.UI.MasterPage
{
...
public void UpdateUserLogin()
{
NicknameLbl.Text = ((Recipes.BasePage)Page).CurrentUser.Nickname;
}
...
}
}

I want to call the UpdateUserLogin() method from a user control, something like this:

((Recipes.MasterPage)this.Page.Master).UpdateUserLogin();

But for some reason the compiler doesn't know Recipes.MasterPage (are you missing an assembly blablabla).

Maybe the problem is that I added the Recipes namespace around MasterPage manually, it wasn't added by VS. By the way I'm using VS Web Developer Express 2008.