diff --git a/ansible/roles/nginx/files/includes/proxy.conf b/ansible/roles/nginx/files/includes/proxy.conf
index cde9479..b5e40f7 100644
--- a/ansible/roles/nginx/files/includes/proxy.conf
+++ b/ansible/roles/nginx/files/includes/proxy.conf
@@ -32,3 +32,9 @@ proxy_set_header X-Forwarded-Uri $request_uri;
 proxy_set_header X-Original-Method $request_method;
 proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
 proxy_set_header X-Real-IP $remote_addr;
+
+# Helper variable for proxying websockets.
+map $http_upgrade $connection_upgrade {
+    default upgrade;
+    '' close;
+}