diff --git a/src/Appwrite/Auth/OAuth2/Etsy.php b/src/Appwrite/Auth/OAuth2/Etsy.php
index 43d4998f49..5fce8733f9 100644
--- a/src/Appwrite/Auth/OAuth2/Etsy.php
+++ b/src/Appwrite/Auth/OAuth2/Etsy.php
@@ -34,7 +34,10 @@ class Etsy extends OAuth2
         "profile_r",
     ];
 
-    private $pkce = '';
+    /**
+     * @var string
+     */
+    private string $pkce = '';
 
     private function getPKCE()
     {