diff --git a/src/lotus/lotusDecorations.ts b/src/lotus/lotusDecorations.ts
index de9407d2..e8c86c76 100644
--- a/src/lotus/lotusDecorations.ts
+++ b/src/lotus/lotusDecorations.ts
@@ -84,7 +84,7 @@ export function startLotusDecorations(): () => void {
       emit();
     };
     w.lazyActions.on(LotusWidgetActions.Decorations, handler);
-    unregister = () =>
+    unregister = (): void =>
       w.lazyActions.off(LotusWidgetActions.Decorations, handler);
   }
   registrations += 1;