diff --git a/src/Engine.php b/src/Engine.php
index 130c6b5..71a34d9 100644
--- a/src/Engine.php
+++ b/src/Engine.php
@@ -77,7 +77,7 @@ function runGame(array $module, int $correctAnswerCounter = 0): void
     [$question, $correctAnswer] = getQuestionAnswerPairHandler($module);
     line(getText($module, 'prompts.question', ['[question]' => $question]));
     $userAnswer = prompt(getText($module, 'prompts.answer'));
-    $isValidAnswer = $correctAnswer === $userAnswer;
+    $isValidAnswer = (string)$correctAnswer === $userAnswer;
 
     /** Game over */
     if (!$isValidAnswer) {
diff --git a/src/Utils/ModuleUtils.php b/src/Utils/ModuleUtils.php
index c87f085..8b3f4b0 100644
--- a/src/Utils/ModuleUtils.php
+++ b/src/Utils/ModuleUtils.php
@@ -16,7 +16,7 @@
  *
  * @return array{
  *     0: string,
- *     1: string
+ *     1: mixed
  * }
  */
 function getQuestionAnswerPairHandler(array $module): array