diff --git a/toolset/run-tests.py b/toolset/run-tests.py
index c226edece26..98ec8c255fd 100644
--- a/toolset/run-tests.py
+++ b/toolset/run-tests.py
@@ -69,7 +69,7 @@ def main(argv=None):
     # Suite options
     # CPU set  options
     parser.add_argument(
-        '--cpuset-cpus',
+        '--cpuset_cpus',
         default=None,
         help='The cpu set to run framework container on')
     parser.add_argument(