diff --git a/tools/search_files.py b/tools/search_files.py
index 1ad31caf08e4bed..62674e8fbbb4e37 100644
--- a/tools/search_files.py
+++ b/tools/search_files.py
@@ -17,3 +17,6 @@ def DoMain(args = []):
   parser.add_argument('directory', help='input directory')
   options = parser.parse_args(args)
   return '\n'.join(utils.SearchFiles(options.directory, options.ext))
+
+if __name__ == '__main__':
+  DoMain(sys.argv[1:])