diff --git a/controllers/nginx/rootfs/etc/nginx/template/nginx.tmpl b/controllers/nginx/rootfs/etc/nginx/template/nginx.tmpl
index 32fb3f12d..920a487e6 100644
--- a/controllers/nginx/rootfs/etc/nginx/template/nginx.tmpl
+++ b/controllers/nginx/rootfs/etc/nginx/template/nginx.tmpl
@@ -479,6 +479,7 @@ stream {
     {{ if gt (len $passthroughBackends) 0 }}
     # map FQDN that requires SSL passthrough
     map $ssl_preread_server_name $stream_upstream {
+        hostnames;
         {{ range $i, $passthrough := .PassthroughBackends }}
         {{ $passthrough.Hostname }}         {{  $passthrough.Backend }};
         {{ end }}