diff --git a/gulp-less/gulp-less.d.ts b/gulp-less/gulp-less.d.ts
index 8ee0a9b485..daab476374 100644
--- a/gulp-less/gulp-less.d.ts
+++ b/gulp-less/gulp-less.d.ts
@@ -11,6 +11,7 @@ declare module "gulp-less" {
         modifyVars?: {};
         paths?: string[];
         plugins?: any[];
+        relativeUrls?: boolean;
     }
 
     function less(options?: IOptions): NodeJS.ReadWriteStream;