diff --git a/python/test/test_mscclpp.py b/python/test/test_mscclpp.py
index e5538553..70c7194c 100644
--- a/python/test/test_mscclpp.py
+++ b/python/test/test_mscclpp.py
@@ -309,7 +309,7 @@ def test_d2d_semaphores(mpi_group: MpiGroup):
 
 
 @parametrize_mpi_groups(2, 4, 8, 16)
-@pytest.mark.parametrize("nelem", [2**i for i in [10]])
+@pytest.mark.parametrize("nelem", [2**i for i in [10, 15, 20]])
 @pytest.mark.parametrize("use_packet", [False, True])
 def test_sm_channels(mpi_group: MpiGroup, nelem: int, use_packet: bool):
     group, connections = create_and_connect(mpi_group, "NVLink")