diff --git a/fabtests/pytest/shm/test_unexpected_msg.py b/fabtests/pytest/shm/test_unexpected_msg.py
index 085a0c3c8c2..e386c24f097 100644
--- a/fabtests/pytest/shm/test_unexpected_msg.py
+++ b/fabtests/pytest/shm/test_unexpected_msg.py
@@ -6,7 +6,7 @@
 
 
 @pytest.mark.functional
-@pytest.mark.parametrize("msg_size", [1, 512, 9000, 1048576]) # cover various switch points of shm/efa protocols
+@pytest.mark.parametrize("msg_size", [1, 512, 9000]) # cover various switch points of shm protocols
 @pytest.mark.parametrize("msg_count", [1, 1024, 2048]) # below and above shm's default rx size
 def test_unexpected_msg(cmdline_args, msg_size, msg_count, memory_type, completion_semantic):
     from common import ClientServerTest