diff --git a/docker-compose-generator/docker-fragments/bitcoin-clightning.yml b/docker-compose-generator/docker-fragments/bitcoin-clightning.yml
index 04dff5f..5b83c30 100644
--- a/docker-compose-generator/docker-fragments/bitcoin-clightning.yml
+++ b/docker-compose-generator/docker-fragments/bitcoin-clightning.yml
@@ -33,7 +33,7 @@ services:
     environment:
       NETWORK: ${NBITCOIN_NETWORK:-regtest}
       COOKIE_FILE: /data/.cookie
-      URL: {BTCPAY_ROOTPATH:-/}lightning-charge/btc/
+      URL: ${BTCPAY_ROOTPATH:-/}lightning-charge/btc/
     volumes:
       - "clightning_bitcoin_datadir:/etc/lightning"
       - "clightning_bitcoin_charge:/data"