diff --git a/netconf/nc_rpc/base/lock.py b/netconf/nc_rpc/base/lock.py
index fc74e83..2f0130d 100644
--- a/netconf/nc_rpc/base/lock.py
+++ b/netconf/nc_rpc/base/lock.py
@@ -23,8 +23,9 @@
 
 class Lock(Rpc):
 
-	def __init__(self, rpc_request, rpc_method, session):
-		super(Lock, self).__init__(rpc_request, rpc_method, session)
+	def __init__(self, rpc_request, rpc_method, grpc_client, session):
+		super(Lock, self).__init__(rpc_request, rpc_method, grpc_client,
+								   session)
 		self._validate_parameters()
 
 	def execute(self):