diff --git a/nvflare/private/fed/app/simulator/simulator_runner.py b/nvflare/private/fed/app/simulator/simulator_runner.py
index 589173ccd2..57e43c20b6 100644
--- a/nvflare/private/fed/app/simulator/simulator_runner.py
+++ b/nvflare/private/fed/app/simulator/simulator_runner.py
@@ -331,9 +331,6 @@ def create_client(self, client_name):
             client_name, self.args
         )
         self.federated_clients.append(client)
-        app_root = os.path.join(self.simulator_root, "app_" + client_name)
-        app_custom_folder = os.path.join(app_root, "custom")
-        sys.path.append(app_custom_folder)
 
     def _set_client_status(self):
         for client in self.federated_clients: