diff --git a/templates/haproxy.conf.j2 b/templates/haproxy.conf.j2
index c32791e..bf1d39c 100644
--- a/templates/haproxy.conf.j2
+++ b/templates/haproxy.conf.j2
@@ -52,7 +52,7 @@ listen {{ entry.group }}
 
 frontend http
   mode http
-  bind /haproxy.sock mode 660
+  bind /haproxy.sock mode 660 alpn h2,http/1.1
 
   acl root url /