diff --git a/cashu/lightning/corelightningrest.py b/cashu/lightning/corelightningrest.py
index da36cdc1..1f02dfc4 100644
--- a/cashu/lightning/corelightningrest.py
+++ b/cashu/lightning/corelightningrest.py
@@ -212,7 +212,7 @@ async def pay_invoice(
 
         checking_id = data["payment_hash"]
         preimage = data["payment_preimage"]
-        fee_msat = data["msatoshi_sent"] - data["msatoshi"]
+        fee_msat = data["amount_sent_msat"] - data["amount_msat"]
 
         return PaymentResponse(
             ok=self.statuses.get(data["status"]),