diff --git a/chrome/content/zotero/xpcom/data/cachedTypes.js b/chrome/content/zotero/xpcom/data/cachedTypes.js
index 317d5011b6..afe8aa1f28 100644
--- a/chrome/content/zotero/xpcom/data/cachedTypes.js
+++ b/chrome/content/zotero/xpcom/data/cachedTypes.js
@@ -463,6 +463,8 @@ Zotero.ItemTypes = new function() {
 			case 'attachmentLink':
 			case 'attachmentPDF':
 			case 'attachmentPDFLink':
+			case 'attachmentEPUB':
+			case 'attachmentEPUBLink':
 			case 'attachmentSnapshot':
 			case 'attachmentWebLink':
 			case 'artwork':