diff --git a/synchro_orleans/settings.py b/synchro_orleans/settings.py
index fdc7c0a..b10b89d 100644
--- a/synchro_orleans/settings.py
+++ b/synchro_orleans/settings.py
@@ -163,7 +163,7 @@ DEFAULT_FROM_EMAIL = os.environ.get('DEFAULT_FROM_EMAIL', 'ne-pas-repondre@orlea
 
 INVOICES_DIR = os.environ.get('INVOICES_DIR', os.path.dirname(__file__))
 INVOICES_LOCATION_PATTERN = os.path.join(INVOICES_DIR, 'facture_{invoice_id}.pdf')
-INVOICES_NOTIFICATION_TIMEOUT = os.environ.get('INVOICES_NOTIFICATION_TIMEOUT', 10) # in days
+INVOICES_NOTIFICATION_TIMEOUT = int(os.environ.get('INVOICES_NOTIFICATION_TIMEOUT', 10)) # in days
 
 IDP_URL = os.environ.get('IDP_URL', '')
 PORTAIL_CITOYEN_URL = os.environ.get('PORTAIL_CITOYEN_URL', '')