diff --git a/lib/plugins/create/templates/aws-fsharp/Handler.fs b/lib/plugins/create/templates/aws-fsharp/Handler.fs
index e255203da6c..1e038614c3c 100644
--- a/lib/plugins/create/templates/aws-fsharp/Handler.fs
+++ b/lib/plugins/create/templates/aws-fsharp/Handler.fs
@@ -4,6 +4,7 @@ open Amazon.Lambda.Core
 [<assembly:LambdaSerializer(typeof<Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer>)>]
 do ()
 
+[<CLIMutable>]
 type Request = { Key1 : string; Key2 : string; Key3 : string }
 type Response = { Message : string; Request : Request }