diff --git a/types/secure-json-parse/index.d.ts b/types/secure-json-parse/index.d.ts
index 01c03e48d9..18b9d9b52b 100644
--- a/types/secure-json-parse/index.d.ts
+++ b/types/secure-json-parse/index.d.ts
@@ -1,12 +1,14 @@
 // Type definitions for secure-json-parse 1.0
 // Project: https://github.com/fastify/secure-json-parse#readme
 // Definitions by: Sjoerd Diepen <https://github.com/OSjoerdWie>
+//                 Mike MacCana <https://github.com/mikemaccana>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 export type Reviver = (this: any, key: string, value: any) => any;
 
 export interface ParseOptions {
-	protoAction: "error" | "remove" | "ignore";
+	protoAction?: "error" | "remove" | "ignore";
+	constructorAction?: "error" | "remove";
 }
 
 export function parse(input: string, reviver?: Reviver, options?: ParseOptions): any;