diff --git a/command.py b/command.py
index 0c3b360..babb833 100644
--- a/command.py
+++ b/command.py
@@ -71,7 +71,7 @@
     groups = mp.config.GetString('manifest.groups')
     if not groups:
       groups = 'all,-notdefault,platform-' + platform.system().lower()
-    groups = [x for x in re.split('[,\s]+', groups) if x]
+    groups = [x for x in re.split(r'[,\s]+', groups) if x]
 
     if not args:
       for project in all_projects.values():