diff --git a/src/Jira/Api.php b/src/Jira/Api.php
index 2c642a5..9292ba4 100644
--- a/src/Jira/Api.php
+++ b/src/Jira/Api.php
@@ -433,7 +433,7 @@ public function createAttachment($issue, $filename, $options = array())
     {
         $options = array_merge(
             array(
-                "file" => '@' . $filename,
+                "file" => '@' . $filename . ';filename=' . pathinfo($filename, PATHINFO_BASENAME),
             ),
             $options
         );