diff --git a/yuthon_salary/wizard/salary_compute_wizard.py b/yuthon_salary/wizard/salary_compute_wizard.py
index dc2a0e83d..23c4f1331 100644
--- a/yuthon_salary/wizard/salary_compute_wizard.py
+++ b/yuthon_salary/wizard/salary_compute_wizard.py
@@ -217,7 +217,9 @@ class SalaryComputeWizard(models.Model):
                                 else:
                                     result = 0
                             elif field_name in ['commuting_allowance', 'seniority_salary']:
-                                result = line.total * internship_days / days
+                                if work_days != days:
+                                    result = line.total * internship_days / days
+
                             elif field_name in ['rank_salary', 'base_salary']:
                                 if work_days != days:
                                     result = round(math.ceil(line.total * 0.8) * internship_days / days + line.total * work_days / days)