diff --git a/src/Ioctl.php b/src/Ioctl.php
index 2524c78..16b5107 100644
--- a/src/Ioctl.php
+++ b/src/Ioctl.php
@@ -22,7 +22,7 @@ public static function attr(mixed $attribute, mixed $defaultValue): mixed
         return self::has($attribute) ? $attribute : $defaultValue;
     }
 
-    public static function ioctl(int $fd, int $request, mixed ...$values): Ioctl
+    public static function ioctl(int $fd, int $request, mixed ...$values): mixed
     {
         return IoctlFunctions::ioctl($fd, $request, ...$values);
     }
diff --git a/src/IoctlFunctions.php b/src/IoctlFunctions.php
index 51d2cf8..9427705 100644
--- a/src/IoctlFunctions.php
+++ b/src/IoctlFunctions.php
@@ -6,7 +6,7 @@
 
 final class IoctlFunctions
 {
-    private static FFI $ffi;
+    private static ?FFI $ffi = null;
 
     public static function ioctl(int $fd, int $request, mixed ...$values)
     {