diff --git a/source/Renderer.php b/source/Renderer.php
index 3fc9f79..14d73dd 100644
--- a/source/Renderer.php
+++ b/source/Renderer.php
@@ -648,7 +648,7 @@ private function attributesFrom($props)
                 $key = $flippedAttributes[$properKey];
             }
 
-            if (is_callable($value)) {
+            if ($value instanceof Closure) {
                 $value = $value();
             }