diff --git a/src/controllers/tickets.js b/src/controllers/tickets.js
index b235ef712..c4ad961d4 100644
--- a/src/controllers/tickets.js
+++ b/src/controllers/tickets.js
@@ -598,7 +598,12 @@ ticketsController.uploadAttachment = function (req, res) {
       mimetype.indexOf('audio/mp3') === -1 &&
       mimetype.indexOf('audio/wav') === -1 &&
       mimetype.indexOf('application/x-zip-compressed') === -1 &&
-      mimetype.indexOf('application/pdf') === -1
+      mimetype.indexOf('application/pdf') === -1 &&
+      //  Office Mime-Types
+      mimetype.indexOf('application/msword') === -1 &&
+      mimetype.indexOf('application/vnd.openxmlformats-officedocument.wordprocessingml.document') === -1 &&
+      mimetype.indexOf('application/vnd.ms-excel') === -1 &&
+      mimetype.indexOf('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet') === -1
     ) {
       error = {
         status: 500,