diff --git a/gulp-typescript/gulp-typescript.d.ts b/gulp-typescript/gulp-typescript.d.ts
index da517a511b..7b16d0a5a2 100644
--- a/gulp-typescript/gulp-typescript.d.ts
+++ b/gulp-typescript/gulp-typescript.d.ts
@@ -23,6 +23,7 @@ declare module "gulp-typescript" {
             sourceRoot?: string;
             sortOutput?: boolean;
             target?: string;
+            typescript?: any;
         }
 
         interface Project {