Issue with ITS adding [] to my URL

For some reason it seems like IE doens't like URL's with brackets in them.

I'm using wgateURL() to generate my url but once I start to add the parameters when it actually renders it adds a [1] to the end of the parameter.

?_{forcetarget[1]=yes&}okcode[1]=MAAD

The wgateURL looks like this: `wgateURL(~forcetarget="yes", ~OkCode="MAAD")`

So is there a way to prevent it from adding in the [1]'s. Internet Explorer is the only browser that seems to fuss about this since I've tested this with Firefox, Safari, Chrome and Opera with success.