diff --git a/backend/templates/_listen.conf b/backend/templates/_listen.conf
index ad1c96ba03..b018a592c1 100644
--- a/backend/templates/_listen.conf
+++ b/backend/templates/_listen.conf
@@ -5,11 +5,14 @@
   #listen [::]:80;
 {% endif %}
 {% if certificate -%}
-  listen 443 ssl{% if http2_support == 1 or http2_support == true %} http2{% endif %};
-{% if ipv6 -%}
-  listen [::]:443 ssl{% if http2_support == 1 or http2_support == true %} http2{% endif %};
+  listen 443 ssl;
+{% if ipv6 -%}/
+  listen [::]:443 ssl;
 {% else -%}
   #listen [::]:443;
 {% endif %}
+{% endif %}
+{% if http2_support == 1 or http2_support == true %}
+  http2 on;
 {% endif %}
   server_name {{ domain_names | join: " " }};