diff --git a/docker/rootfs/etc/nginx/conf.d/include/force-ssl.conf b/docker/rootfs/etc/nginx/conf.d/include/force-ssl.conf
index aa52f335..6e88c71a 100644
--- a/docker/rootfs/etc/nginx/conf.d/include/force-ssl.conf
+++ b/docker/rootfs/etc/nginx/conf.d/include/force-ssl.conf
@@ -1,5 +1,5 @@
 set $test "";
-if ($scheme = "http") {
+if ($http_x_forwarded_proto = "http") {
 	set $test "H";
 }
 if ($request_uri = /.well-known/acme-challenge/test-challenge) {