diff --git a/core/services/ardupilot_manager/mavlink_proxy/test_all.py b/core/services/ardupilot_manager/mavlink_proxy/test_all.py
index be6484499c..b0ae1545e5 100644
--- a/core/services/ardupilot_manager/mavlink_proxy/test_all.py
+++ b/core/services/ardupilot_manager/mavlink_proxy/test_all.py
@@ -182,6 +182,7 @@ def test_mavproxy(valid_output_endpoints: Set[Endpoint], valid_master_endpoints:
     )
 
 
+@pytest.mark.serial
 def test_mavlink_router(valid_output_endpoints: Set[Endpoint], valid_master_endpoints: Set[Endpoint]) -> None:
     if not MAVLinkRouter.is_ok():
         warnings.warn("Failed to test MAVLinkRouter service", UserWarning)
@@ -205,6 +206,7 @@ def test_mavlink_router(valid_output_endpoints: Set[Endpoint], valid_master_endp
     )
 
 
+@pytest.mark.serial
 def test_mavp2p(valid_output_endpoints: Set[Endpoint], valid_master_endpoints: Set[Endpoint]) -> None:
     if not MAVP2P.is_ok():
         warnings.warn("Failed to test MAVP2P service", UserWarning)