diff --git a/node/node.d.ts b/node/node.d.ts
index 2dfa0fc2b8..140a72c748 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -193,8 +193,7 @@ declare module NodeJS {
 
     export interface WritableStream extends EventEmitter {
         writable: boolean;
-        write(buffer: Buffer, cb?: Function): boolean;
-        write(str: string, cb?: Function): boolean;
+        write(buffer: Buffer|string, cb?: Function): boolean;
         write(str: string, encoding?: string, cb?: Function): boolean;
         end(): void;
         end(buffer: Buffer, cb?: Function): void;