diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index 91d60b3..9a92535 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -26,7 +26,7 @@
 
             , "api": {
                 "web_socket": {
-                    "url": "wss://advanced-trade-ws.coinbase.com"
+                    "url": "wss://@env{SIM_HOST}advanced-trade-ws.coinbase.com"
                 }
                 , "REST": {
                     "open_orders_url": ["GET", "https://api.coinbase.com/api/v3/brokerage/orders/historical/batch"]