diff --git a/src/cloudformation/template/parameter.ts b/src/cloudformation/template/parameter.ts
index a39848f..32674d5 100644
--- a/src/cloudformation/template/parameter.ts
+++ b/src/cloudformation/template/parameter.ts
@@ -44,4 +44,4 @@ export type Parameter = ({
   minValue?: number;
 }
 
-export type Params<T> = { [K in keyof T]: <R = string>() => Value<R> }
\ No newline at end of file
+export type Params<T> = { [K in keyof T]: () => Value<any> }
\ No newline at end of file