diff --git a/src/python/devtest/os/CmdTestOs.py b/src/python/devtest/os/CmdTestOs.py
index 97ca843..d3add1a 100644
--- a/src/python/devtest/os/CmdTestOs.py
+++ b/src/python/devtest/os/CmdTestOs.py
@@ -29,7 +29,7 @@ async def run_test_case(phase, env, machine, case): # export
             raise Exception("machine is not clear for running tests")
         rr = await case.run(env, machine, phase)
         if rr:
-            slog(ERR, "FAIL: ", rr)
+            slog_m(ERR, "FAIL: ", rr)
     except Exception:
         rr = sys.exc_info()[1]
         slog(ERR, "FAIL: ", rr)