diff --git a/lecture_csv.py b/lecture_csv.py
index bf81159..c16a962 100644
--- a/lecture_csv.py
+++ b/lecture_csv.py
@@ -11,8 +11,10 @@ def numeroJour(date):
     """renvoie un entier correspondant au numéro du jour correspondant (entre 1 et 365)"""
     try:
         day = datetime.datetime.strptime(date, "%Y-%m-%d")
-        num_day = day.strftime('%j')
-        return int(num_day)
+        num_day = int(day.strftime('%j'))
+        if estBissextile(date) and num_day == 366:
+            num_day = 365
+        return num_day
     except(ValueError):
         return None