diff --git a/src/OAuth2/Response.php b/src/OAuth2/Response.php
index 88c1ad5f..74653d14 100644
--- a/src/OAuth2/Response.php
+++ b/src/OAuth2/Response.php
@@ -144,7 +144,7 @@ public function getStatusCode()
      * @param string $text
      * @throws InvalidArgumentException
      */
-    public function setStatusCode($statusCode, $text = null)
+    public function setStatusCode(int $statusCode, ?string $text = null): static
     {
         $this->statusCode = (int) $statusCode;
         if ($this->isInvalid()) {
diff --git a/src/OAuth2/ResponseInterface.php b/src/OAuth2/ResponseInterface.php
index fe920864..4e0d847c 100644
--- a/src/OAuth2/ResponseInterface.php
+++ b/src/OAuth2/ResponseInterface.php
@@ -23,7 +23,7 @@ public function addHttpHeaders(array $httpHeaders);
     /**
      * @param int $statusCode
      */
-    public function setStatusCode($statusCode);
+    public function setStatusCode(int $statusCode, ?string $text = null): static;
 
     /**
      * @param int    $statusCode