diff --git a/node/node-0.10.d.ts b/node/node-0.10.d.ts
index 73f9627820..74e6cd3eac 100644
--- a/node/node-0.10.d.ts
+++ b/node/node-0.10.d.ts
@@ -79,7 +79,7 @@ declare var Buffer: {
 ************************************************/
 declare module NodeJS {
     export interface ErrnoException extends Error {
-        errno?: any;
+        errno?: number;
         code?: string;
         path?: string;
         syscall?: string;