diff --git a/addons/account/account.py b/addons/account/account.py
index 589730c9ca7..22c234dd0ad 100644
--- a/addons/account/account.py
+++ b/addons/account/account.py
@@ -1143,7 +1143,7 @@ class account_move(osv.osv):
         return amount
 
     def _centralise(self, cr, uid, move, mode, context=None):
-        assert(mode in ('debit', 'credit'), 'Invalid Mode') #to prevent sql injection
+        assert mode in ('debit', 'credit'), 'Invalid Mode' #to prevent sql injection
         if context is None:
             context = {}