diff --git a/git_cl.py b/git_cl.py
index d59ea135b..51f1e97a5 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -5077,7 +5077,7 @@ def _RunClangFormatDiff(opts, clang_diff_files, top_dir, upstream_commit):
     except clang_format.NotFoundError as e:
       DieWithError(e)
 
-    cmd = ['vpython', script, '-p0']
+    cmd = ['vpython3', script, '-p0']
     if not opts.dry_run and not opts.diff:
       cmd.append('-i')