diff --git a/tests/decap/test_subnet_decap.py b/tests/decap/test_subnet_decap.py
index 64c0d00fd0f..305cc6ac3d2 100644
--- a/tests/decap/test_subnet_decap.py
+++ b/tests/decap/test_subnet_decap.py
@@ -10,6 +10,7 @@
 from ptf.mask import Mask
 from tests.common.dualtor.dual_tor_utils import rand_selected_interface     # noqa F401
 from tests.common.fixtures.ptfhost_utils import copy_arp_responder_py       # noqa F401
+from tests.common.dualtor.mux_simulator_control import toggle_all_simulator_ports_to_rand_selected_tor_m   # noqa F401
 from tests.common.config_reload import config_reload
 
 logger = logging.getLogger(__name__)
@@ -206,7 +207,9 @@ def verify_packet_with_expected(ptfadapter, stage, pkt, exp_pkt, send_port,
 @pytest.mark.parametrize("stage", ["positive", "negative"])
 def test_vlan_subnet_decap(request, rand_selected_dut, tbinfo, ptfhost, ptfadapter, ip_version, stage,
                            prepare_subnet_decap_config, prepare_vlan_subnet_test_port,
-                           prepare_negative_ip_port_map, setup_arp_responder):     # noqa F811
+                           prepare_negative_ip_port_map, setup_arp_responder,   # noqa F811
+                           toggle_all_simulator_ports_to_rand_selected_tor_m,   # noqa F811
+                           setup_standby_ports_on_rand_unselected_tor):         # noqa F811
     ptf_src_port, _, upstream_port_ids = prepare_vlan_subnet_test_port
 
     encapsulated_packet = build_encapsulated_vlan_subnet_packet(ptfadapter, rand_selected_dut, ip_version, stage)