diff --git a/python/tidy.py b/python/tidy.py
index 44f7ba45b63..dd2ef9d29cc 100644
--- a/python/tidy.py
+++ b/python/tidy.py
@@ -25,6 +25,8 @@ ignored_files = [
     os.path.join(".", "support", "*"),
     os.path.join(".", "tests", "wpt", "css-tests", "*"),
     os.path.join(".", "tests", "wpt", "harness", "*"),
+    os.path.join(".", "tests", "wpt", "sync", "*"),
+    os.path.join(".", "tests", "wpt", "sync_css", "*"),
     os.path.join(".", "tests", "wpt", "update", "*"),
     os.path.join(".", "tests", "wpt", "web-platform-tests", "*"),
     os.path.join(".", "python", "mach", "*"),