diff --git a/addons/mail/i18n/mail.pot b/addons/mail/i18n/mail.pot
index 23496dbba76..06feeebb361 100644
--- a/addons/mail/i18n/mail.pot
+++ b/addons/mail/i18n/mail.pot
@@ -6113,6 +6113,13 @@ msgstr ""
 msgid "You are in channel <b>#%s</b>."
 msgstr ""
 
+#. module: mail
+#. openerp-web
+#: code:addons/mail/static/src/js/attachment_box.js:0
+#, python-format
+msgid "You are not allowed to upload an attachment here."
+msgstr ""
+
 #. module: mail
 #. openerp-web
 #: code:addons/mail/static/src/js/discuss.js:0
diff --git a/addons/mail/static/src/js/attachment_box.js b/addons/mail/static/src/js/attachment_box.js
index 17e91b410e9..f0bf5801108 100644
--- a/addons/mail/static/src/js/attachment_box.js
+++ b/addons/mail/static/src/js/attachment_box.js
@@ -127,8 +127,12 @@ var AttachmentBox = Widget.extend({
     /**
      * @private
      */
-    _onUploaded: function() {
-        this.trigger_up('reload_attachment_box');
+    _onUploaded: function(ev, response) {
+        if (response.error) {
+            this.do_warn(_t("Error"), _t("You are not allowed to upload an attachment here."));
+        } else {
+            this.trigger_up('reload_attachment_box');
+        }
     },
 });