diff --git a/lib/bing.js b/lib/bing.js
index 90cdb31..f9c52e5 100644
--- a/lib/bing.js
+++ b/lib/bing.js
@@ -63,7 +63,9 @@ var Bing = function( options ) {
                    + "&$top=" + opts.top
                    + "&$skip=" + opts.skip
                    + (opts.market ? "&Market=%27" + opts.market + "%27" : '')
-                   + (opts.imagefilters ? "&ImageFilters=%27" + opts.imagefilters + "%27" : '');
+                   + (opts.imagefilters 
+                       ? '&' + qs.stringify({ "ImageFilters": "'" + opts.imagefilters + "'" })
+                       : '');
 
     request({
       uri: reqUri,