diff --git a/templates/group_created.json.j2 b/templates/group_created.json.j2
index 431a760..eec4a02 100644
--- a/templates/group_created.json.j2
+++ b/templates/group_created.json.j2
@@ -441,7 +441,7 @@
       "inputParameters": {
         "memberpolicy" : "${create_role_policy_member.output.body.id}",
         "otherpolicies" : "${join_parallel_policy_addition.output[*].body.id}",
-        "scriptExpression": "return [$.memberpolicy].concat($.otherpolicies)"
+        "scriptExpression": "Java.to([$.memberpolicy].concat($.otherpolicies),'java.lang.String[]')"
       }
     },
 		{