Active Directory how to enable an account that is disabled?

I can use the Disable Entry snap and it successfully sets the Active Directory userAccountControl attribute to 514.  But I can't figure out how to Enable an account that has been disabled.  I've tried setting the userAccountControl attribute to 512, but it doesn't like the format of the attribute.  I think maybe there is a sub-attribute that needs to be set...?  Does anyone have any suggestions on what to try?