diff --git a/addons/mail/static/src/js/composers/basic_composer.js b/addons/mail/static/src/js/composers/basic_composer.js
index e9b60db0d62..d3f787e6960 100644
--- a/addons/mail/static/src/js/composers/basic_composer.js
+++ b/addons/mail/static/src/js/composers/basic_composer.js
@@ -447,7 +447,7 @@ var BasicComposer = Widget.extend({
         });
         attachments = attachments.concat(uploadAttachments);
         this.set('attachment_ids', attachments);
-        event.target.value = "";
+        ev.target.value = "";
     },
     /**
      * @private