I'm trying to add additional attribute data-icon to my Action Link, but I'm getting the error below:

Invalid anonymous type member declarator. Anonymous type members must be declared with a member assignment, simple name or member access.

Works:

@Html.ActionLink("Profile", "Details", "Profile", new { id = 11 }, 
            new { @rel = "external", @id = "btnProfile" })

Exception:

@Html.ActionLink("Profile", "Details", "Profile", new { id = 11 }, 
            new { @rel = "external", @id = "btnProfile", @data-icon = "gear" })
asp.net-mvc-3 c#-4.0 razor
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