diff --git a/addons/im_support/static/src/js/discuss.js b/addons/im_support/static/src/js/discuss.js
index df2526a2a26..0f29370b049 100644
--- a/addons/im_support/static/src/js/discuss.js
+++ b/addons/im_support/static/src/js/discuss.js
@@ -42,9 +42,9 @@ Discuss.include({
                 if (!channel.available) {
                     self.basicComposer.do_hide();
                 }
-                $buttonAddAttachment.hide();
+                $buttonAddAttachment.toggleClass('o_hidden', true);
             } else {
-                $buttonAddAttachment.show();
+                $buttonAddAttachment.toggleClass('o_hidden', false);
             }
         });
     },