diff --git a/tools/build_project.py b/tools/build_project.py
index 9f377645..6c72b48a 100755
--- a/tools/build_project.py
+++ b/tools/build_project.py
@@ -10,6 +10,7 @@
 import copy
 import json
 import shutil
+import typing
 import hashlib
 import logging
 import pathlib