diff --git a/bin/addons/base/module/module.py b/bin/addons/base/module/module.py
index d239de2d022..6f818a69041 100644
--- a/bin/addons/base/module/module.py
+++ b/bin/addons/base/module/module.py
@@ -480,7 +480,7 @@ class module(osv.osv):
             if not mod.description:
                 logger.notifyChannel("init", netsvc.LOG_WARNING, 'module %s: description is empty !' % (mod.name,))
 
-            if not mod.certificateor or not mod.certificate.isdigit():
+            if not mod.certificate or not mod.certificate.isdigit():
                 logger.notifyChannel('init', netsvc.LOG_WARNING, 'module %s: no quality certificate' % (mod.name,))
             else:
                 val = long(mod.certificate[2:]) % 97 == 29