diff --git a/src/index.ts b/src/index.ts
index e76ebe07..a46c876e 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -47,7 +47,7 @@ class Webhooks<
     options: EmitterWebhookEventMap[WebhookEventName] & { signature: string }
   ) => Promise<void>;
 
-  constructor(options?: Options<E>) {
+  constructor(options?: Options<E, TTransformed>) {
     if (!options || !options.secret) {
       throw new Error("[@octokit/webhooks] options.secret required");
     }
diff --git a/src/types.ts b/src/types.ts
index 50bd481a..d63120ed 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -37,10 +37,10 @@ interface BaseWebhookEvent<
   payload: EmitterEventPayloadMap[TName];
 }
 
-export interface Options<T extends EmitterWebhookEvent> {
+export interface Options<T extends EmitterWebhookEvent, TTransformed> {
   path?: string;
   secret?: string;
-  transform?: TransformMethod<T>;
+  transform?: TransformMethod<T, TTransformed>;
 }
 
 type TransformMethod<T extends EmitterWebhookEvent, V = T> = (
@@ -65,7 +65,8 @@ type Hooks = {
   [key: string]: Function[];
 };
 
-export interface State extends Options<any> {
+export interface State<TTransformed = unknown>
+  extends Options<any, TTransformed> {
   eventHandler?: any;
   hooks: Hooks;
 }
diff --git a/test/typescript-validate.ts b/test/typescript-validate.ts
index dc8da134..9002b77e 100644
--- a/test/typescript-validate.ts
+++ b/test/typescript-validate.ts
@@ -91,7 +91,7 @@ export default async function () {
   });
 
   // Check all supported options
-  const webhooks = new Webhooks<EmitterWebhookEvent, { foo: string }>({
+  const webhooks = new Webhooks({
     secret: "bleh",
     path: "/webhooks",
     transform: (event) => {