diff --git a/examples/json-schema-to-grammar.py b/examples/json-schema-to-grammar.py
index d74ab0710..6fa46971a 100755
--- a/examples/json-schema-to-grammar.py
+++ b/examples/json-schema-to-grammar.py
@@ -3,6 +3,7 @@ import argparse
 import json
 import re
 import sys
+from typing import Any, Dict, List, Set, Tuple
 
 # whitespace is constrained to a single space char to prevent model "running away" in
 # whitespace. Also maybe improves generation quality?