--- a/tools/lint/wpt/wpt.py
+++ b/tools/lint/wpt/wpt.py
@@ -22,17 +22,17 @@ def lint(files, config, **kwargs):
             data = json.loads(line)
         except ValueError:
             return
         data["level"] = "error"
         data["path"] = os.path.relpath(os.path.join(tests_dir, data["path"]), kwargs['root'])
         results.append(result.from_config(config, **data))
 
     path = os.path.join(tests_dir, "lint")
-    proc = ProcessHandler([path, "--json"], env=os.environ,
+    proc = ProcessHandler([path, "--json"] + files, env=os.environ,
                           processOutputLine=process_line)
     proc.run()
     try:
         proc.wait()
     except KeyboardInterrupt:
         proc.kill()
 
     return results