diff --git a/examples/azure/windows_custom_image.json b/examples/azure/windows_custom_image.json
index 7ae8761d5..018ba34d1 100644
--- a/examples/azure/windows_custom_image.json
+++ b/examples/azure/windows_custom_image.json
@@ -4,7 +4,7 @@
     "client_secret": "{{env `ARM_CLIENT_SECRET`}}",
     "resource_group": "{{env `ARM_RESOURCE_GROUP`}}",
     "storage_account": "{{env `ARM_STORAGE_ACCOUNT`}}",
-    "subscription_id": "{{env `ARM_SUBSCRIPTION_ID`}}"
+    "subscription_id": "{{env `ARM_SUBSCRIPTION_ID`}}",
     "object_id": "{{env `ARM_OJBECT_ID`}}"
   },
   "builders": [