diff --git a/packages/support/src/Concerns/EvaluatesClosures.php b/packages/support/src/Concerns/EvaluatesClosures.php
index 47bb8439ed..9870918a46 100644
--- a/packages/support/src/Concerns/EvaluatesClosures.php
+++ b/packages/support/src/Concerns/EvaluatesClosures.php
@@ -130,7 +130,7 @@ trait EvaluatesClosures
 
         $class = $parameter->getDeclaringClass();
 
-        if (blank($class)) {
+        if (is_null($class)) {
             return $name;
         }