Visual Studio 2008 - Multiple Membership Providers?

I have created two custome membership providers that I would like to add to my web.config. The first one would be the default that the asp.net application would use. The second would be called by a WCF service that I have in the same application.

The providers in the membership section of my web.config looks like the following:

<add name="SiteProvider" type="MyNameSpace.SiteProvider, MyNameSpace" ApplicationName="Si2" EnablePasswordReset="true" PasswordStrengthRegularExpression="(?=[w$#_ ]{8,})(?=.*?d)(?=.*?[A-z])[w$#_ ]*" ResetPasswordMinimumLength="8" ResetPasswordPattern="USL9SLU9SLU9SLLLL" ResetPasswordAllowDuplicateCharacters="false" />
<add name="WCFProvider" type="MyNameSpace.WCFProvider, MyNameSpace" ApplicationName="Si2" EnablePasswordReset="true" PasswordStrengthRegularExpression="(?=[w$#_ ]{8,})(?=.*?d)(?=.*?[A-z])[w$#_ ]*" ResetPasswordMinimumLength="8" ResetPasswordPattern="USL9SLU9SLU9SLLLL" ResetPasswordAllowDuplicateCharacters="false" />

I receive the error "Item has already beed added. Key in dictionary: 'SiteProvider' Key being added: 'SiteProvider'" any time I browse to the site.

This doesnt make sense to me sense they have unique names. If i remove the second provider the site is browseable.