diff --git a/node/node.d.ts b/node/node.d.ts
index b1e849535c..c30b2a9b45 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -609,7 +609,7 @@ declare module "child_process" {
         stderr: stream.Readable;
         pid: number;
         kill(signal?: string): void;
-        send(message: any, sendHandle: any): void;
+        send(message: any, sendHandle?: any): void;
         disconnect(): void;
     }