diff --git a/tests/unittests/image/test_ms_ssim.py b/tests/unittests/image/test_ms_ssim.py
index 89b9b5778bd..53989382519 100644
--- a/tests/unittests/image/test_ms_ssim.py
+++ b/tests/unittests/image/test_ms_ssim.py
@@ -127,6 +127,7 @@ def _run_ms_ssim_ddp(rank: int, world_size: int, free_port: int):
         cleanup_ddp()
 
 
+@pytest.mark.DDP
 @pytest.mark.skipif(not torch.cuda.is_available(), reason="test requires cuda")
 @pytest.mark.skipif(_IS_WINDOWS, reason="DDP not supported on Windows")
 def test_ms_ssim_reduction_none_ddp():
diff --git a/tests/unittests/image/test_ssim.py b/tests/unittests/image/test_ssim.py
index e327e7d7f70..4f433d54d9c 100644
--- a/tests/unittests/image/test_ssim.py
+++ b/tests/unittests/image/test_ssim.py
@@ -382,6 +382,7 @@ def _run_ssim_ddp(rank: int, world_size: int, free_port: int):
         cleanup_ddp()
 
 
+@pytest.mark.DDP
 @pytest.mark.skipif(not torch.cuda.is_available(), reason="test requires cuda")
 @pytest.mark.skipif(_IS_WINDOWS, reason="DDP not supported on Windows")
 def test_ssim_reduction_none_ddp():