diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index 76207ec..4f2d4bc 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -19,7 +19,7 @@
 
         "mktdata" : {
             # 
-            "class":  "cvttpy_trading.exchanges.mkt_simulator.mkt_data.DisabledRtSimulatorMdFeed"
+            "class":  "cvttpy_trading.exchanges.mkt_simulator.mkt_client.DisabledRtSimulatorMdFeed"
         },
         "order_entry": {
             "class":  "cvttpy_trading.exchanges.mkt_simulator.oe_client.MarketSimulatorOEClient"