diff --git a/lib/integrations/slack/send_on_slack_service.rb b/lib/integrations/slack/send_on_slack_service.rb
index 5d8b52e24..6f780ae38 100644
--- a/lib/integrations/slack/send_on_slack_service.rb
+++ b/lib/integrations/slack/send_on_slack_service.rb
@@ -56,7 +56,7 @@ class Integrations::Slack::SendOnSlackService < Base::SendOnChannelService
   def post_message
     @slack_message = slack_client.chat_postMessage(
       channel: hook.reference_id,
-      text: message_content,
+      text: ActionView::Base.full_sanitizer.sanitize(message_content),
       username: sender_name(message.sender),
       thread_ts: conversation.identifier,
       icon_url: avatar_url(message.sender)