diff --git a/lib/corereqs.js b/lib/corereqs.js
index 28f884f..7e20019 100644
--- a/lib/corereqs.js
+++ b/lib/corereqs.js
@@ -190,11 +190,20 @@ module.exports = {
 
    GetWindowAttributes: [
        ['CxSL', [3, 2]],
-       function(buf)
+       function(buf, backingStore)
        {
            // TODO: change from array to named object fields
-           var res = buf.unpack('LSCCLLCCCCCLLLS');
-           return res;
+           var res = buf.unpack('LSCCLLCCCCLLLS');
+           var ret = {
+               backingStore: backingStore
+           };
+           ( "visual klass bitGravity winGravity backingPlanes backingPixel" +
+             " saveUnder mapIsInstalled mapState overrideRedirect colormap" +
+             " allEventMasks myEventMasks doNotPropogateMask" )
+           .split(' ').forEach(function(field, index) {
+               ret[field] = res[index];
+           });
+           return ret;
        }
    ],