diff --git a/git_cl.py b/git_cl.py
index fadf1c93f..6c0c280f1 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -4926,7 +4926,7 @@ def CMDformat(parser, args):
       if not yapf_style:
         yapf_style = 'pep8'
 
-      cmd = [yapf_tool, '--style', yapf_style, f]
+      cmd = [yapf_tool, '--parallel', '--style', yapf_style, f]
 
       has_formattable_lines = False
       if not opts.full: