diff --git a/.github/workflows/aws-torch-latest-full.yml b/.github/workflows/aws-torch-latest-full.yml
index a909b8458dbf..5f8b6183f968 100644
--- a/.github/workflows/aws-torch-latest-full.yml
+++ b/.github/workflows/aws-torch-latest-full.yml
@@ -370,7 +370,7 @@ jobs:
           echo "Running sequential tests with TORCH_CUDA_ARCH_LIST=$TORCH_CUDA_ARCH_LIST on $GPU_COUNT GPUs"
           cd tests
           rm -rf /mnt/aio/pytest
-          pytest --instafail --timeout 600 --forked -m 'sequential' --basetemp=/mnt/aio/pytest unit/ \
+          pytest --instafail --timeout 600 -m 'sequential' --basetemp=/mnt/aio/pytest unit/ \
             --ignore=unit/runtime/zero/test_nvme_checkpointing.py \
             --ignore=unit/ops/aio/test_gds.py \
             --ignore=unit/launcher/test_user_args.py \
diff --git a/tests/unit/ops/aio/test_fast_file_writer_fd_close.py b/tests/unit/ops/aio/test_fast_file_writer_fd_close.py
index 9a218ab3aba5..7b63b8976ebb 100644
--- a/tests/unit/ops/aio/test_fast_file_writer_fd_close.py
+++ b/tests/unit/ops/aio/test_fast_file_writer_fd_close.py
@@ -70,6 +70,7 @@ def _build_writer(file_path):
     return FastFileWriter(file_path=str(file_path), config=cfg)
 
 
+@pytest.mark.sequential
 def test_close_releases_fd_after_unlink(tmp_path):
     """Single save + unlink must not leave a deleted-fd reference."""
     target = tmp_path / "ckpt_single.pt"
@@ -87,6 +88,7 @@ def test_close_releases_fd_after_unlink(tmp_path):
                              f"This indicates _fini() did not os.close(self._aio_fd).")
 
 
+@pytest.mark.sequential
 @pytest.mark.parametrize("n_iters", [5, 20])
 def test_rotation_loop_does_not_leak(tmp_path, n_iters):
     """N iterations of save+close+unlink should leave zero deleted-fds.