diff --git a/lemarche/utils/apis/api_brevo.py b/lemarche/utils/apis/api_brevo.py
index 33a353b4e..d0de73308 100644
--- a/lemarche/utils/apis/api_brevo.py
+++ b/lemarche/utils/apis/api_brevo.py
@@ -124,7 +124,7 @@ def send_transactional_email_with_template(
     recipient_email: str,
     recipient_name: str,
     variables: dict,
-    subject: str,
+    subject=None,
     from_email=settings.DEFAULT_FROM_EMAIL,
     from_name=settings.DEFAULT_FROM_NAME,
 ):
diff --git a/lemarche/utils/apis/api_mailjet.py b/lemarche/utils/apis/api_mailjet.py
index d1e955036..763239977 100644
--- a/lemarche/utils/apis/api_mailjet.py
+++ b/lemarche/utils/apis/api_mailjet.py
@@ -99,7 +99,7 @@ def send_transactional_email_with_template(
     recipient_email: str,
     recipient_name: str,
     variables: dict,
-    subject: str,
+    subject=None,
     from_email=settings.DEFAULT_FROM_EMAIL,
     from_name=settings.DEFAULT_FROM_NAME,
     client=None,