diff --git a/plugins/nginx-vhosts/internal-functions b/plugins/nginx-vhosts/internal-functions
index d1a95bc8a..fbe7a0e6f 100755
--- a/plugins/nginx-vhosts/internal-functions
+++ b/plugins/nginx-vhosts/internal-functions
@@ -79,7 +79,7 @@ fn-nginx-vhosts-manage-hsts() {
   local HSTS_TEMPLATE="$PLUGIN_AVAILABLE_PATH/nginx-vhosts/templates/hsts.conf.sigil"
 
   if [[ "$HSTS" == "false" ]] || [[ "$SSL_ENABLED" != "true" ]]; then
-    rm -rf "NGINX_HSTS_CONF"
+    rm -rf "$NGINX_HSTS_CONF"
     return
   fi