diff --git a/currency_rate_update/__openerp__.py b/currency_rate_update/__openerp__.py
index cc4b54b90..1cce4f384 100755
--- a/currency_rate_update/__openerp__.py
+++ b/currency_rate_update/__openerp__.py
@@ -74,9 +74,7 @@ A function field let you know your currency configuration.
 If in multi-company mode, the base currency will be the first company's currency
 found in database.
 
-Thanks to main contributors : Grzegorz Grzelak
-
-
+Thanks to main contributors : Grzegorz Grzelak, Alexis de Lattre
 """,
     "depends" : ["base",
                  "account"], #Added to ensure account security groups are present
diff --git a/currency_rate_update/currency_rate_update.py b/currency_rate_update/currency_rate_update.py
index ad216f43d..1ad031a28 100755
--- a/currency_rate_update/currency_rate_update.py
+++ b/currency_rate_update/currency_rate_update.py
@@ -98,11 +98,12 @@ class Currency_rate_update_service(osv.osv):
                         ]
 
     def _check_max_delta_days(self, cr, uid, ids):
-        for i in ids:
-            value_to_check = self.read(cr, uid, i, ['max_delta_days'])['max_delta_days']
-            if value_to_check >= 0:
-                return True
-            else: return False
+        for company in self.read(cr, uid, ids, ['max_delta_days']):
+            if company['max_delta_days'] >= 0:
+                continue
+            else:
+                return False
+        return True
 
     _constraints = [
         (_check_max_delta_days, "'Max delta days' must be >= 0", ['max_delta_days']),