diff --git a/nginx.tmpl b/nginx.tmpl
index 07e2b50..4125cbe 100644
--- a/nginx.tmpl
+++ b/nginx.tmpl
@@ -168,7 +168,10 @@ server {
 }
 {{ end }}
 
-{{ range $host, $containers := groupByMulti $ "Env.VIRTUAL_HOST" "," }}
+{{/* Get the VIRTUAL_HOST_VARNAME for filtering */}}
+{{ $virtual_host_varname := (or ($.Env.VIRTUAL_HOST_VARNAME) "VIRTUAL_HOST") }}
+
+{{ range $host, $containers := groupByMulti $ (print "Env." $virtual_host_varname) "," }}
 
 {{ $host := trim $host }}
 {{ $is_regexp := hasPrefix "~" $host }}