diff --git a/src/Executor/Executor.php b/src/Executor/Executor.php
index fd1a8b494f..df4c5fd8f5 100644
--- a/src/Executor/Executor.php
+++ b/src/Executor/Executor.php
@@ -190,7 +190,7 @@ class Executor
         int $memory,
         bool $logging,
         string $runtimeEntrypoint = '',
-        ?int $requestTimeout
+        ?int $requestTimeout = null
     ) {
         if (empty($headers['host'])) {
             $headers['host'] = System::getEnv('_APP_DOMAIN', '');