diff --git a/lib/codereview/codereview.py b/lib/codereview/codereview.py
index 750ae87..4aeff90 100644
--- a/lib/codereview/codereview.py
+++ b/lib/codereview/codereview.py
@@ -694,6 +694,8 @@
 	cwd = os.getcwd()
 	files = [RelativePath(repo.root + '/' + f, cwd) for f in files]
 	files = [f for f in files if os.access(f, 0)]
+	if not files:
+		return
 	try:
 		cmd = subprocess.Popen(["gofmt", "-l"] + files, shell=False, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, close_fds=True)
 		cmd.stdin.close()