diff --git a/lib/cartodb/controllers/named_maps.js b/lib/cartodb/controllers/named_maps.js
index 8b3765fe..e224fc7f 100644
--- a/lib/cartodb/controllers/named_maps.js
+++ b/lib/cartodb/controllers/named_maps.js
@@ -124,8 +124,8 @@ NamedMapsController.prototype.staticMap = function(req, res, next) {
     var cdbUser = req.context.user;
 
     var format = req.params.format === 'jpg' ? 'jpeg' : 'png';
-    req.params.format = req.params.format || 'png';
-    req.params.layer = req.params.layer || 'all';
+    res.locals.format = req.params.format || 'png';
+    res.locals.layer = req.params.layer || 'all';
 
     var namedMapProvider;
     step(
@@ -143,7 +143,7 @@ NamedMapsController.prototype.staticMap = function(req, res, next) {
             assert.ifError(err);
 
             namedMapProvider = _namedMapProvider;
-
+ 
             self.prepareLayerFilterFromPreviewLayers(cdbUser, req, res, namedMapProvider, this);
         },
         function prepareImageOptions(err) {