diff --git a/ts/types/Attachment.ts b/ts/types/Attachment.ts
index 68dc4e1453..1e3d14e65f 100644
--- a/ts/types/Attachment.ts
+++ b/ts/types/Attachment.ts
@@ -1,5 +1,3 @@
-import is from '@sindresorhus/is';
-
 import { MIMEType } from './MIME';