diff --git a/src/UI/src/Traits/HasAsync.php b/src/UI/src/Traits/HasAsync.php
index 9faafb1ac..c2fd6c409 100644
--- a/src/UI/src/Traits/HasAsync.php
+++ b/src/UI/src/Traits/HasAsync.php
@@ -28,7 +28,7 @@ public function isAsync(): bool
     public function whenAsync(Closure $callback): static
     {
         return $this->when(
-            fn() => $this->getCore()->getRequest()->get('_component_name') === $this->getName(),
+            fn(): bool => $this->getCore()->getRequest()->get('_component_name') === $this->getName(),
             fn() => $callback($this)
         );
     }