diff --git a/addons/mass_mailing/models/mass_mailing.py b/addons/mass_mailing/models/mass_mailing.py
index 4c3bab77de1..8daa5ce392b 100644
--- a/addons/mass_mailing/models/mass_mailing.py
+++ b/addons/mass_mailing/models/mass_mailing.py
@@ -500,7 +500,7 @@ class MassMailing(models.Model):
                 res = filter(lambda x: x['state'] == state_value, read_group_res)
                 if not res:
                     res = filter(lambda x: x['state'] == state_value, read_group_all_states)
-                res[0]['state'] = [state_value, state_name]
+                res[0]['state'] = state_value
                 result.append(res[0])
             return result
         else: