diff --git a/lib/Github/ResultPager.php b/lib/Github/ResultPager.php
index d7f67c861b6..4583e5e1268 100644
--- a/lib/Github/ResultPager.php
+++ b/lib/Github/ResultPager.php
@@ -59,7 +59,7 @@ class ResultPager implements ResultPagerInterface
      *
      * @return void
      */
-    public function __construct(?Client $client, ?int $perPage = null)
+    public function __construct(Client $client, ?int $perPage = null)
     {
         if (null !== $perPage && ($perPage < 1 || $perPage > 100)) {
             throw new ValueError(sprintf('%s::__construct(): Argument #2 ($perPage) must be between 1 and 100, or null', self::class));