diff --git a/addons/mail/static/src/js/client_action.js b/addons/mail/static/src/js/client_action.js
index 822f87dc0a2..82a68e52eb9 100644
--- a/addons/mail/static/src/js/client_action.js
+++ b/addons/mail/static/src/js/client_action.js
@@ -111,14 +111,6 @@ var ChatAction = Widget.extend(ControlPanelMixin, {
             var channel_id = $(event.target).data("channel-id");
             chat_manager.unsubscribe(chat_manager.get_channel(channel_id));
         },
-        "click .o_snackbar_undo": function (event) {
-            event.preventDefault();
-            var channel = this.channel;
-            this.$snackbar.remove();
-            this.clear_needactions_def.then(function (msgs_ids) {
-                chat_manager.undo_mark_as_read(msgs_ids, channel);
-            });
-        },
         "click .o_mail_annoying_notification_bar .fa-close": function () {
             this.$(".o_mail_annoying_notification_bar").slideUp();
         },
@@ -425,7 +417,6 @@ var ChatAction = Widget.extend(ControlPanelMixin, {
         this.messages_separator_position = undefined; // reset value on channel change
         this.unread_counter = this.channel.unread_counter;
         this.last_seen_message_id = this.channel.last_seen_message_id;
-        this.clear_needactions_def = $.Deferred();
         if (this.$snackbar) {
             this.$snackbar.remove();
         }
@@ -436,14 +427,7 @@ var ChatAction = Widget.extend(ControlPanelMixin, {
         return this.fetch_and_render_thread().then(function () {
             // Mark channel's messages as read and clear needactions
             if (channel.type !== 'static') {
-                // Display snackbar if needactions have been cleared
-                if (channel.needaction_counter > 0) {
-                    self.render_snackbar('mail.chat.UndoSnackbar', {
-                        nb_needactions: channel.needaction_counter,
-                    });
-                }
                 chat_manager.mark_channel_as_seen(channel);
-                self.clear_needactions_def = chat_manager.mark_all_as_read(channel);
             }
 
             // Update control panel
diff --git a/addons/mail/static/src/less/client_action.less b/addons/mail/static/src/less/client_action.less
index eb91fd78fb3..53ac45d8d3f 100644
--- a/addons/mail/static/src/less/client_action.less
+++ b/addons/mail/static/src/less/client_action.less
@@ -167,10 +167,6 @@
             cursor: pointer;
             background-color: darken(@gray, 8%);
             color: white;
-            .o_snackbar_undo {
-                margin-left: 8px;
-                padding: 8px;
-            }
         }
     }
 }
diff --git a/addons/mail/static/src/xml/client_action.xml b/addons/mail/static/src/xml/client_action.xml
index b6701a45cb7..ff2122256cc 100644
--- a/addons/mail/static/src/xml/client_action.xml
+++ b/addons/mail/static/src/xml/client_action.xml
@@ -113,13 +113,6 @@
         <i t-if="status == 'offline'" class="o_mail_user_status fa fa-circle-o" title="Offline"/>
     </t>
 
-    <t t-name="mail.chat.UndoSnackbar">
-        <div class="alert o_mail_snackbar" data-dismiss="alert" role="alert">
-            <t t-esc="nb_needactions"/> mention(s) marked as read.
-            <a href="#" class="alert-link o_snackbar_undo">Undo</a>
-        </div>
-    </t>
-
     <t t-name="mail.chat.MessageSentSnackbar">
         <div class="alert o_mail_snackbar" data-dismiss="alert" role="alert">
             Message sent in "<t t-esc="record_name"/>".