diff --git a/pis-connect.js b/pis-connect.js
index 6a532c5..3c4b88b 100644
--- a/pis-connect.js
+++ b/pis-connect.js
@@ -70,7 +70,7 @@ app.post("/connect", async (req, res) => {
             psu_type: req.body.psu_type || 'retail',
             country: req.body.country || 'fr',
             scheme: req.body.scheme,
-            expiry: req.body.expiry,
+            expiry: req.body.expiry || undefined,
             scheduled_expiration_policy: req.body.scheduled_expiration_policy
         };