diff --git a/types/node/index.d.ts b/types/node/index.d.ts
index cf6933747a..8799948bd1 100644
--- a/types/node/index.d.ts
+++ b/types/node/index.d.ts
@@ -1843,7 +1843,7 @@ declare module "child_process" {
     }
 
     export interface MessageOptions {
-        keepOpen: boolean;
+        keepOpen?: boolean;
     }
 
     export interface SpawnOptions {