diff --git a/packages/string-templates/src/helpers/list.ts b/packages/string-templates/src/helpers/list.ts
index b5796d8f1d..c31f7b0a70 100644
--- a/packages/string-templates/src/helpers/list.ts
+++ b/packages/string-templates/src/helpers/list.ts
@@ -57,7 +57,7 @@ export function getJsHelperList() {
   }
   helpers = {
     ...helpers,
-    addedHelpers,
+    ...addedHelpers,
   }
 
   for (const toRemove of helpersToRemoveForJs) {