diff --git a/superagent/index.d.ts b/superagent/index.d.ts
index 1a91cf76f3..570ad59eb1 100644
--- a/superagent/index.d.ts
+++ b/superagent/index.d.ts
@@ -104,6 +104,7 @@ declare namespace request {
       set(field: Object): this;
       timeout(ms: number): this;
       type(val: string): this;
+      unset(field: string): this;
       use(fn: Function): this;
       withCredentials(): this;
       write(data: string, encoding?: string): this;