diff --git a/promise/promise.d.ts b/promise/promise.d.ts
index 387a01397..9237b8908 100644
--- a/promise/promise.d.ts
+++ b/promise/promise.d.ts
@@ -26,6 +26,6 @@ declare module Promise {
 		then<R>(onFulfilled?: (value: T) => IThenable<R>|R, onRejected?: (error: any) => IThenable<R>|R): IThenable<R>;
 		catch<R>(onRejected?: (error: any) => IThenable<R>|R): IThenable<R>;
 		done<R>(onFulfilled?: (value: T) => IThenable<R>|R, onRejected?: (error: any) => IThenable<R>|R): IThenable<R>;
-		nodeify<R>(callbacl: Function): IThenable<R>;
+		nodeify<R>(callback: Function): IThenable<R>;
 	}
 }