1 files changed, 1 insertions, 1 deletions
diff --git a/src/NXP/Classes/CustomFunction.php b/src/NXP/Classes/CustomFunction.php
index 636435c..bf36405 100644
--- a/src/NXP/Classes/CustomFunction.php
+++ b/src/NXP/Classes/CustomFunction.php
@@ -32,7 +32,7 @@ class CustomFunction
      * @param int $places
      * @throws ReflectionException
      */
-    public function __construct(string $name, callable $function, int $places = null)
+    public function __construct(string $name, callable $function, ?int $places = null)
     {
         $this->name = $name;
         $this->function = $function;