Removing plus "+" sign from Dynamic Google Adwords in url
I'm using dynamic Google Adwords and dynamically builing my url. The problem is that my keyword is made of two words (ex: green house) and when it is displayed in my url, it appears as "green+house." Is there a way to remove the plus sign? I'd like to remove the space altogether or at least have a hyphen instead of the plus sign displayed (I'm referring to the display url).