diff --git a/src/panels/lovelace/hui-root.ts b/src/panels/lovelace/hui-root.ts
index 40aa919423..a73150685a 100644
--- a/src/panels/lovelace/hui-root.ts
+++ b/src/panels/lovelace/hui-root.ts
@@ -102,7 +102,7 @@ class HUIRoot extends hassLocalizeLitMixin(LitElement) {
     }
   }
 
-  protected render() {
+  protected render() : TemplateResult {
     return html`
     ${this.renderStyle()}
     <app-route .route="${this.route}" pattern="/:view" data="${