diff --git a/gulp-help-doc/gulp-help-doc.d.ts b/gulp-help-doc/gulp-help-doc.d.ts
index 31aa0d764a..80d4922774 100644
--- a/gulp-help-doc/gulp-help-doc.d.ts
+++ b/gulp-help-doc/gulp-help-doc.d.ts
@@ -45,7 +45,7 @@ declare module "gulp-help-doc" {
         }
 
         interface Usage {
-            (gulp: gulp.Gulp, options?: UsageOptions): Promise
+            (gulp: gulp.Gulp, options?: UsageOptions): Promise<any>
         }
 
     }