diff --git a/src/controller/python/chip/ChipReplStartup.py b/src/controller/python/chip/ChipReplStartup.py
index 7bc4988ddd1284..779636ed128bb8 100644
--- a/src/controller/python/chip/ChipReplStartup.py
+++ b/src/controller/python/chip/ChipReplStartup.py
@@ -107,7 +107,7 @@ def mattersetdebug(enableDebugMode: bool = True):
 
 caList = certificateAuthorityManager.activeCaList
 
-devCtrl = caList[0].adminList[0].NewController(paaTrustStorePath=args.trustStore)
+devCtrl = caList[0].adminList[0].NewController(paaTrustStorePath=args.trust_store)
 builtins.devCtrl = devCtrl
 
 atexit.register(StackShutdown)