diff --git a/main.py b/main.py
index a0d76d0..37fbc69 100644
--- a/main.py
+++ b/main.py
@@ -633,7 +633,7 @@ class ClercAttrib2Biz():
 
                 csv_col.data[115] = self.ifNotNull(data.Patient["lastname"]) + " " + self.ifNotNull(data.Patient["firstname"])
                 csv_col.data[108] = data.Patient["complement"]
-                csv_col.data[109] = datetime.strptime(data.Patient["birthdate"], "%Y-%m-%d").strftime("%d.%m.%Y") if data.Patient["birthdate"] is not None else "date naissance inconnue"
+                csv_col.data[109] = datetime.strptime(data.Patient["birthdate"], "%Y-%m-%d").strftime("%d.%m.%Y") if data.Patient["birthdate"] is not None else ""
                 if data.Patient["insurance_policy_number"] is not None and '-' not in data.Patient["insurance_policy_number"]:
                     csv_col.data[109] += ", " + data.Patient["insurance_policy_number"]