diff --git a/pre-upload.py b/pre-upload.py
index 182123e..e22a032 100755
--- a/pre-upload.py
+++ b/pre-upload.py
@@ -635,7 +635,8 @@
 
   for rustfile in files:
     contents = _get_file_content(rustfile, commit)
-    output = _run_command(cmd=['rustfmt'], input=contents.encode('utf-8'),
+    output = _run_command(cmd=['rustfmt', '--edition', '2018'],
+                          input=contents.encode('utf-8'),
                           stderr=subprocess.STDOUT)
     if output != contents:
       errors.append(rustfile)