diff --git a/src/Images/Sauce.coffee b/src/Images/Sauce.coffee
index 63bcf5a40..3ceb60e20 100644
--- a/src/Images/Sauce.coffee
+++ b/src/Images/Sauce.coffee
@@ -48,7 +48,7 @@ Sauce =
           skip = true
           return ''
 
-        if key is 'url' and parameter isnt '%%' and parameter isnt '%semi'
+        if key is 'url' and parameter not in ['%', 'semi']
           type = JSON.stringify type if /^javascript:/i.test parts['url']
           type = encodeURIComponent type
         type