diff --git a/addons/gamification/models/badge.py b/addons/gamification/models/badge.py
index d8a3ef18840..74a85c1cf02 100644
--- a/addons/gamification/models/badge.py
+++ b/addons/gamification/models/badge.py
@@ -155,7 +155,7 @@ class gamification_badge(osv.Model):
             string='Authorized Users',
             help="Only these people can give this badge"),
         'rule_auth_badge_ids': fields.many2many('gamification.badge',
-            'rel_badge_badge', 'badge1_id', 'badge2_id',
+            'gamification_badge_rule_badge_rel', 'badge1_id', 'badge2_id',
             string='Required Badges',
             help="Only the people having these badges can give this badge"),
 
diff --git a/addons/gamification/models/challenge.py b/addons/gamification/models/challenge.py
index 63c23f30cff..3f14417ae48 100644
--- a/addons/gamification/models/challenge.py
+++ b/addons/gamification/models/challenge.py
@@ -129,7 +129,7 @@ class gamification_challenge(osv.Model):
         'manager_id': fields.many2one('res.users',
             string='Responsible', help="The user responsible for the challenge."),
 
-        'user_ids': fields.many2many('res.users', 'user_ids',
+        'user_ids': fields.many2many('res.users', 'gamification_challenge_users_rel',
             string='Users',
             help="List of users participating to the challenge"),
         'user_domain': fields.char('User domain', help="Alternative to a list of users"),
@@ -149,7 +149,7 @@ class gamification_challenge(osv.Model):
         'end_date': fields.date('End Date',
             help="The day a new challenge will be automatically closed. If no periodicity is set, will use this date as the goal end date."),
 
-        'invited_user_ids': fields.many2many('res.users', 'invited_user_ids',
+        'invited_user_ids': fields.many2many('res.users', 'gamification_invited_user_ids_rel',
             string="Suggest to users"),
 
         'line_ids': fields.one2many('gamification.challenge.line', 'challenge_id',