diff --git a/test/mocks/mass-pnf-sim/mass-pnf-sim.py b/test/mocks/mass-pnf-sim/mass-pnf-sim.py
index 9ec8c00..ba05986 100755
--- a/test/mocks/mass-pnf-sim/mass-pnf-sim.py
+++ b/test/mocks/mass-pnf-sim/mass-pnf-sim.py
@@ -135,7 +135,7 @@
         completed = subprocess.run(
             'cd ' +
             foldername +
-            "; ./simulator.sh stop",
+            "; ./simulator.sh stop " + str(i),
             shell=True)
         print('Stopping:', completed.stdout)