diff --git a/src/Macros/StrMacros.php b/src/Macros/StrMacros.php
index b3fec98..0310fbc 100644
--- a/src/Macros/StrMacros.php
+++ b/src/Macros/StrMacros.php
@@ -60,7 +60,7 @@ public static function firstAndLastWords(): void
                 ->values()
                 ->whenNotEmpty(function (Collection $words): string {
                     return trim($words->first().' '.$words->last());
-                }, $string);
+                }, fn () => $string);
         });
     }