diff --git a/Regtest/docker-compose.yml b/Regtest/docker-compose.yml
index 4fd5a3f..cb521fe 100644
--- a/Regtest/docker-compose.yml
+++ b/Regtest/docker-compose.yml
@@ -13,6 +13,7 @@ services:
       BTCPAY_NETWORK: regtest
       BTCPAY_EXPLORERURL: http://nbxplorer:32838/
       BTCPAY_BIND: 0.0.0.0:49392
+      BTCPAY_INTERNALURL: http://btcpayserver:49392/
     links:
       - nbxplorer
       - postgres