diff --git a/update_traj_schema.py b/update_traj_schema.py
index 0d9b778e6..a76806264 100644
--- a/update_traj_schema.py
+++ b/update_traj_schema.py
@@ -62,6 +62,7 @@ class Location:
 
 // Auto-generated by update_traj_schema.py
 #pragma once
+#include <cstdint>
 namespace choreo {{
 [[deprecated("Use kTrajSchemaVersion.")]]
 inline constexpr uint32_t kTrajSpecVersion = {version};