diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 844eaf9dfea..225e55c0591 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1060,8 +1060,11 @@ class Action(openerpweb.Controller):
         context = req.session.eval_context(req.context)
         action_type = Actions.read([action_id], ['type'], context)
         if action_type:
-            action = req.session.model(action_type[0]['type']).read([action_id], False,
-                                                                    context)
+            ctx = {}
+            if action_type[0]['type'] == 'ir.actions.report.xml':
+                ctx.update({'bin_size': True})
+            ctx.update(context)
+            action = req.session.model(action_type[0]['type']).read([action_id], False, ctx)
             if action:
                 value = clean_action(req, action[0])
         return {'result': value}
diff --git a/addons/web/static/src/js/views.js b/addons/web/static/src/js/views.js
index 2c616359f01..37738d3ec51 100644
--- a/addons/web/static/src/js/views.js
+++ b/addons/web/static/src/js/views.js
@@ -454,7 +454,7 @@ openerp.web.Sidebar = openerp.web.Widget.extend({
                     };
                     self.rpc("/web/action/load", {
                         action_id: item.action.id,
-                        context: _.extend({"bin_size": true}, additional_context)
+                        context: additional_context
                     }, function(result) {
                         result.result.context = _.extend(result.result.context || {},
                             additional_context);