diff --git a/hr_payroll_gamification/__manifest__.py b/hr_payroll_gamification/__manifest__.py
index 277008b9..1c261450 100755
--- a/hr_payroll_gamification/__manifest__.py
+++ b/hr_payroll_gamification/__manifest__.py
@@ -1,7 +1,7 @@
 {
     'name': 'Payroll Gamification',
     'description': 'Payroll Gamification',
-    'version': '11.0.1.0.1',
+    'version': '12.0.1.0.1',
     'website': 'https://hibou.io/',
     'author': 'Hibou Corp. <hello@hibou.io>',
     'license': 'AGPL-3',
diff --git a/hr_payroll_gamification/models/payroll.py b/hr_payroll_gamification/models/payroll.py
index 3ac9c10e..a652053e 100644
--- a/hr_payroll_gamification/models/payroll.py
+++ b/hr_payroll_gamification/models/payroll.py
@@ -19,7 +19,7 @@ class Payslip(models.Model):
             amount += bu.badge_id.payroll_amount
         for bu in contract.employee_id.badge_ids.filtered(lambda bu: (
                 bu.badge_id.payroll_type == 'period'
-                and date_from <= bu.create_date <= date_to
+                and date_from <= str(bu.create_date) <= date_to
         )):
             amount += bu.badge_id.payroll_amount
         return amount