diff --git a/node/node.d.ts b/node/node.d.ts
index 2405b4408d..f2b5eee24c 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -631,7 +631,11 @@ declare module "child_process" {
         killSignal?: string;
     }, callback: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
     export function exec(command: string, callback: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
-    export function execFile(file: string, args: string[], options: {
+    export function execFile(file: string,
+        callback?: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
+    export function execFile(file: string, args?: string[],
+        callback?: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
+    export function execFile(file: string, args?: string[], options?: {
         cwd?: string;
         stdio?: any;
         customFds?: any;
@@ -640,7 +644,7 @@ declare module "child_process" {
         timeout?: number;
         maxBuffer?: string;
         killSignal?: string;
-    }, callback: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
+    }, callback?: (error: Error, stdout: Buffer, stderr: Buffer) =>void ): ChildProcess;
     export function fork(modulePath: string, args?: string[], options?: {
         cwd?: string;
         env?: any;