diff --git a/addons/mail/static/src/utils/common/hooks.js b/addons/mail/static/src/utils/common/hooks.js
index ec2cc734b5f..0671ec83451 100644
--- a/addons/mail/static/src/utils/common/hooks.js
+++ b/addons/mail/static/src/utils/common/hooks.js
@@ -238,6 +238,7 @@ export function useScrollSnapshot(refName, { onWillPatch: p_onWillPatch, onPatch
  */
 export function useMessageHighlight(duration = 2000) {
     let timeout;
+    /** @type {import("@mail/core/common/thread_service").ThreadService} */
     const threadService = useService("mail.thread");
     const state = useState({
         async highlightMessage(msgId, thread) {