diff --git a/templates/sites/vanilla.conf.template b/templates/sites/vanilla.conf.template
index 6e6db00..fea9a0f 100644
--- a/templates/sites/vanilla.conf.template
+++ b/templates/sites/vanilla.conf.template
@@ -88,8 +88,8 @@ server {
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
     }
 
-    location ^/(.*)/web-service/snfgenerator/session$ {
-        proxy_pass http://dash:3000/session;
+    location ~ ^/(.*)/web-service/snfgenerator/session$ {
+        proxy_pass http://dash:3000/session$is_args$args;
         proxy_redirect off;
         proxy_set_header Host $host;
         proxy_set_header X-Real-IP $remote_addr;