diff --git a/require/database.php b/require/database.php
index 29aed1c..d89b898 100644
--- a/require/database.php
+++ b/require/database.php
@@ -68,7 +68,7 @@
             return !empty($this->getArticle($id));
         }
 
-        public function checkPuzzle(int $id, int $code) {
+        public function checkPuzzle(int $id, string $code) {
             $stmt = $this->pdo_article->prepare("SELECT * FROM puzzles WHERE (id == :id AND code == :code)");
             $stmt->bindValue(":id", $id);
             $stmt->bindValue(":code", $code);