diff --git a/iap/example_gce_backend.py b/iap/example_gce_backend.py
index adf40727a46..4c257080216 100755
--- a/iap/example_gce_backend.py
+++ b/iap/example_gce_backend.py
@@ -29,9 +29,10 @@ def root():
     jwt = flask.request.headers.get('x-goog-iap-jwt-assertion')
     if jwt is None:
         return 'Unauthorized request.'
+    expected_audience = '/projects/{}/global/backendServices/{}'.format(CLOUD_PROJECT_ID, BACKEND_SERVICE_ID)
     user_id, user_email, error_str = (
         validate_jwt.validate_iap_jwt(
-            jwt, CLOUD_PROJECT_ID, BACKEND_SERVICE_ID))
+            jwt, expected_audience))
     if error_str:
         return 'Error: {}'.format(error_str)
     else: