diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index b5cc1b0..9ef2046 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -29,7 +29,7 @@
                     "url": "wss://@env{SIM_HOST}:@env{SIM_ORDER_ENTRY_WS_PORT}"
                 }
                 , "REST": {
-                    "open_orders_url": ["GET", "https://@env{SIM_HOST}:"]
+                    "open_orders_url": ["GET", "https://@env{SIM_HOST}:@env{SIM_ORDER_ENTRY_REST_PORT}/"]
                     , "submit_order_url": ["POST", "https://api.coinbase.com/api/v3/brokerage/orders"]
                     , "cancel_order_url": ["POST", "https://api.coinbase.com/api/v3/brokerage/orders/batch_cancel"]
                 }