diff --git a/form-data/form-data.d.ts b/form-data/form-data.d.ts
index 0f22b8ff5..98dc1567d 100644
--- a/form-data/form-data.d.ts
+++ b/form-data/form-data.d.ts
@@ -7,7 +7,7 @@
 
 declare module "form-data" {
 	export class FormData {
-		append(key: string, value: any): FormData;
+		append(key: string, value: any, options?: any): FormData;
 		getHeaders(): Object;
 		// TODO expand pipe
 		pipe(to: any): any;