diff --git a/src/types.ts b/src/types.ts
index ff17f31..fb220f5 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -85,5 +85,5 @@ export interface WebhookEventStatus {
   webhookId: string;
   eventId: string;
   status: string;
-  error?: {message: string; details: any};
+  error?: string;
 }
diff --git a/test/client.test.ts b/test/client.test.ts
index 2baa064..0cf8d08 100644
--- a/test/client.test.ts
+++ b/test/client.test.ts
@@ -427,7 +427,7 @@ describe('client', () => {
       webhookId: 'testWebhookId',
       eventId: 'testEventId',
       status: 'error',
-      error: {message: 'error message', details: {detail1: 'abc'}},
+      error: 'error message',
     });
     mock.done();
   });