diff --git a/src/HttpStatus.php b/src/HttpStatus.php
index 496d8e0..f5fab1a 100644
--- a/src/HttpStatus.php
+++ b/src/HttpStatus.php
@@ -219,7 +219,7 @@ public static function getReasonException($code)
      *
      * @return int
      */
-    protected static function filterStatusCode($code)
+    public static function filterStatusCode($code)
     {
         $code = filter_var($code, FILTER_VALIDATE_INT, ['options' => [
             'min_range' => self::MINIMUM,