diff --git a/src/common.js b/src/common.js
index f6973f45fe..bc9036beff 100644
--- a/src/common.js
+++ b/src/common.js
@@ -3789,8 +3789,7 @@
 
     Sao.common.download_file = function(data, name, options) {
         if (options === undefined) {
-            var type = Sao.common.guess_mimetype(
-                name ? name.split('.').pop() : undefined);
+            var type = Sao.common.guess_mimetype(name);
             options = {type: type};
         }
         var blob = new Blob([data], options);