diff --git a/command.py b/command.py
index 2ee0a43..936ab40 100644
--- a/command.py
+++ b/command.py
@@ -15,6 +15,7 @@
 
 import os
 import optparse
+import platform
 import re
 import sys
 
@@ -69,7 +70,7 @@
 
     groups = mp.config.GetString('manifest.groups')
     if groups is None:
-      groups = 'default'
+      groups = 'default,platform-' + platform.system().lower()
     groups = [x for x in re.split('[,\s]+', groups) if x]
 
     if not args: