diff --git a/ts/styleguide/StyleGuideUtil.ts b/ts/styleguide/StyleGuideUtil.ts
index ecba629d8..3e13fa0e4 100644
--- a/ts/styleguide/StyleGuideUtil.ts
+++ b/ts/styleguide/StyleGuideUtil.ts
@@ -19,6 +19,7 @@ export { BackboneWrapper } from '../components/utility/BackboneWrapper';
 import { Quote } from '../components/conversation/Quote';
 import * as HTML from '../html';
 
+import * as Attachment from '../../ts/types/Attachment';
 import * as MIME from '../../ts/types/MIME';
 
 // TypeScript wants two things when you import:
@@ -125,6 +126,7 @@ parent.ReactDOM = ReactDOM;
 
 parent.Signal.HTML = HTML;
 parent.Signal.Types.MIME = MIME;
+parent.Signal.Types.Attachment = Attachment;
 parent.Signal.Components = {
   Quote,
 };