diff --git a/host_vars/sso.c3heaven.de b/host_vars/sso.c3heaven.de
index 112bb9da98574771ff86604cfbbb4f325b1adc5b..263c8805f518bc84ae21d082dd112adc1b094e2c 100644
--- a/host_vars/sso.c3heaven.de
+++ b/host_vars/sso.c3heaven.de
@@ -14,6 +14,7 @@ nginx_https_sites:
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;
         proxy_set_header X-Forwarded-For $remote_addr;
+        proxy_set_header X-Forwarded-Proto https;
         proxy_pass http://localhost:8080/;
    headers: null