diff --git a/app/hlds/definitions.py b/app/hlds/definitions.py
index 4267ff4..56d1182 100644
--- a/app/hlds/definitions.py
+++ b/app/hlds/definitions.py
@@ -2,15 +2,20 @@
 
 from os import path
 from typing import List
+import subprocess
 from .parser import parse_all_directory
 from .models import Location
 
 
-__all__ = ["location_definitions"]
+__all__ = ["location_definitions", "location_definition_version"]
+
+# pylint: disable=invalid-name
 
 # TODO Use proper way to get resources, see https://stackoverflow.com/a/10935674
 DATA_DIR = path.join(path.dirname(__file__), "..", "..", "data")
 
-# pylint: disable=invalid-name
 location_definitions: List[Location] = parse_all_directory(DATA_DIR)
 location_definitions.sort(key=lambda l: l.name)
+
+proc = subprocess.run(["git", "rev-parse", "HEAD"], stdout=subprocess.PIPE, check=True)
+location_definition_version = proc.stdout
diff --git a/app/views/order.py b/app/views/order.py
index aa67663..88e7fd3 100644
--- a/app/views/order.py
+++ b/app/views/order.py
@@ -11,7 +11,7 @@ from flask_login import current_user, login_required
 
 from forms import AnonOrderItemForm, OrderForm, OrderItemForm
 from models import Order, OrderItem, User, db
-from hlds.definitions import location_definitions
+from hlds.definitions import location_definitions, location_definition_version
 from notification import post_order_to_webhook
 from utils import ignore_none
 
@@ -157,6 +157,7 @@ def order_item_create(order_id: int) -> typing.Any:
 
     item = OrderItem()
     form.populate_obj(item)
+    item.hlds_data_version = location_definition_version
     item.order_id = order_id
     if not current_user.is_anonymous():
         item.user_id = current_user.id