diff --git a/components/handler.js b/components/handler.js
index 788347c..d57cc31 100644
--- a/components/handler.js
+++ b/components/handler.js
@@ -568,7 +568,7 @@ class Handler {
       '${user_properties}': this.options.authorization.user_properties,
       '${user_type}': this.options.authorization.meta.type,
       '${version_name}': this.options.version.number,
-      '${assets_index_name}': this.version.assetIndex.id,
+      '${assets_index_name}': this.options.version.custom || this.options.version.number,
       '${game_directory}': this.options.overrides.gameDirectory || this.options.root,
       '${assets_root}': assetPath,
       '${game_assets}': assetPath,