diff --git a/src/Endpoints/CustomHostnames.php b/src/Endpoints/CustomHostnames.php
index 592ed71..7a0d2de 100644
--- a/src/Endpoints/CustomHostnames.php
+++ b/src/Endpoints/CustomHostnames.php
@@ -164,7 +164,7 @@ class CustomHostnames implements API
         string $sslType = '',
         array $sslSettings = [],
         string $customOriginServer = '',
-        ?bool $wildcard = null,
+        bool $wildcard = null,
         string $bundleMethod = '',
         array $customSsl = []
     ): \stdClass {