diff --git a/avocado/plugins/multiplex.py b/avocado/plugins/multiplex.py
index 098630c7629b6749c7e8728352bd5833385ea11e..bfd95afa01e399c88cf2ec1b15c289f4a344acb9 100644
--- a/avocado/plugins/multiplex.py
+++ b/avocado/plugins/multiplex.py
@@ -48,7 +48,7 @@ class Multiplex(CLICmd):
 
         parser.add_argument('--filter-out', nargs='*', default=[],
                             help='Filter out path(s) from multiplexing')
-        parser.add_argument('-s', '--system-wide', action='store_true',
+        parser.add_argument('--system-wide', action='store_true',
                             help="Combine the files with the default "
                             "tree.")
         parser.add_argument('-c', '--contents', action='store_true',