diff --git a/src/Timeout/Timeout.php b/src/Timeout/Timeout.php
index 8bbd9a582..275fbdf4f 100644
--- a/src/Timeout/Timeout.php
+++ b/src/Timeout/Timeout.php
@@ -10,7 +10,9 @@ final class Timeout
 {
     /** @var bool */
     private static $initialized = false;
-    private static $stackTrace;
+
+    /** @var string|null */
+    private static $stackTrace = null;
 
     /**
      * Automatically setup a timeout (based on the AWS Lambda timeout).
@@ -70,7 +72,7 @@ private static function init(): void
             if (Timeout::$stackTrace !== null) {
                 // we already thrown an exception.
                 error_log('Lambda timed out');
-                error_log((new LambdaTimeout())->getTraceAsString());
+                error_log((new LambdaTimeout)->getTraceAsString());
                 error_log('Original stack trace');
                 error_log(Timeout::$stackTrace);
                 Timeout::$stackTrace = null;
diff --git a/tests/Timeout/TimeoutTest.php b/tests/Timeout/TimeoutTest.php
index f52774172..4bc06085e 100644
--- a/tests/Timeout/TimeoutTest.php
+++ b/tests/Timeout/TimeoutTest.php
@@ -60,6 +60,7 @@ public function test timeouts are interrupted in time()
         } catch (LambdaTimeout $e) {
             $time = 1000 * (microtime(true) - $start);
             $this->assertEqualsWithDelta(2000, $time, 200, 'We must wait about 1 second');
+            Timeout::reset();
         } catch (\Throwable $e) {
             $this->fail('It must throw a LambdaTimeout.');
         }