diff --git a/src/panels/lovelace/hui-root.ts b/src/panels/lovelace/hui-root.ts
index 4f6b82416b..133564f067 100644
--- a/src/panels/lovelace/hui-root.ts
+++ b/src/panels/lovelace/hui-root.ts
@@ -95,7 +95,7 @@ class HUIRoot extends hassLocalizeLitMixin(LitElement) {
     );
   }
 
-  public disconnectedCallback() {
+  public disconnectedCallback(): void {
     super.disconnectedCallback();
     if (this._unsubNotifications) {
       this._unsubNotifications();