diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index a199cba7854..9947ff880e9 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1371,7 +1371,7 @@ class Binary(openerpweb.Controller):
         elif dbname is None:
             dbname = db_monodb(req)
 
-        if uid is None:
+        if not uid:
             uid = openerp.SUPERUSER_ID
 
         if not dbname: