diff --git a/types/catbox/index.d.ts b/types/catbox/index.d.ts
index 32fbdf6f3f..bd41889e07 100644
--- a/types/catbox/index.d.ts
+++ b/types/catbox/index.d.ts
@@ -231,7 +231,7 @@ export interface DecoratedPolicyOptions<T> extends PolicyOptions<T> {
     /**
      * @default false
      */
-    getDecoratedValue?: boolean;
+    getDecoratedValue: boolean | undefined;
 }
 
 export interface GenerateFuncFlags {