diff --git a/www/common/onlyoffice/inner.js b/www/common/onlyoffice/inner.js
index 1207bff32..07bca60b0 100644
--- a/www/common/onlyoffice/inner.js
+++ b/www/common/onlyoffice/inner.js
@@ -1386,6 +1386,7 @@ define([
             }, {
                 typeInput: $select[0]
             }, true);
+            $select.find('button').addClass('btn');
         };
 
         var x2tImportImagesInternal = function(x2t, images, i, callback) {