diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 3ebbfb02af6..8b3a21fdee8 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1168,6 +1168,7 @@ class Binary(http.Controller):
             }
         except Exception:
             args = {'error': "Something horrible happened"}
+            _logger.exception("Fail to upload attachment %s" % ufile.filename)
         return out % (simplejson.dumps(callback), simplejson.dumps(args))
 
     @http.route([