diff --git a/passbook/providers/app_gw/templates/app_gw/setup_modal.html b/passbook/providers/app_gw/templates/app_gw/setup_modal.html
index 650820b41..5e1cea562 100644
--- a/passbook/providers/app_gw/templates/app_gw/setup_modal.html
+++ b/passbook/providers/app_gw/templates/app_gw/setup_modal.html
@@ -40,8 +40,8 @@ services:
     environment:
       OAUTH2_PROXY_CLIENT_ID: {{ provider.client.client_id }}
       OAUTH2_PROXY_CLIENT_SECRET: {{ provider.client.client_secret }}
-      OAUTH2_PROXY_OIDC_ISSUER_URL: https://{{ request.META.host }}/application/oidc
       OAUTH2_PROXY_REDIRECT_URL: https://{{ provider.external_host }}/oauth2/callback
+      OAUTH2_PROXY_OIDC_ISSUER_URL: https://{{ request.META.HTTP_HOST }}/application/oidc
       OAUTH2_PROXY_COOKIE_SECRET: {{ cookie_secret }}
       OAUTH2_PROXY_UPSTREAM: http://{{ provider.internal_host }}</textarea>
       </div>