diff --git a/chrome/content/zotero/xpcom/translation/translate.js b/chrome/content/zotero/xpcom/translation/translate.js
index 72c1e2721..6653270e2 100644
--- a/chrome/content/zotero/xpcom/translation/translate.js
+++ b/chrome/content/zotero/xpcom/translation/translate.js
@@ -124,6 +124,7 @@ Zotero.Translate.Sandbox = {
 				for(var j=0; j<nAttachments; j++) {
 					if(attachments[j].document) {
 						attachments[j].url = attachments[j].document.location.href;
+						attachments[j].mimeType = "text/html";
 						delete attachments[j].document;
 					}
 				}