diff --git a/make_sts.sh b/make_sts.sh
index 727e95c..e3a18f0 100644
--- a/make_sts.sh
+++ b/make_sts.sh
@@ -5,6 +5,7 @@ gcloud services enable storagetransfer.googleapis.com --project="${PROJECT_ID}"
 
 # Create the Storage Transfer service agent on first use and show its email
 curl -s \
+    -H "X-Goog-User-Project: ${PROJECT_ID}" \
     -H "Authorization: Bearer $(gcloud auth print-access-token)" \
     "https://storagetransfer.googleapis.com/v1/googleServiceAccounts/${PROJECT_ID}"