diff --git a/tests/Functional/bootstrap.php b/tests/Functional/bootstrap.php
index 1128b784..df7b3642 100644
--- a/tests/Functional/bootstrap.php
+++ b/tests/Functional/bootstrap.php
@@ -9,10 +9,14 @@
 chdir(__DIR__ . '/../..');
 require_once __DIR__ . '/../../vendor/autoload.php';
 
+$sysInfo = \Temporal\Testing\SystemInfo::detect();
+
 $environment = Environment::create();
 $environment->startTemporalTestServer();
 (new SearchAttributeTestInvoker)();
-$environment->startRoadRunner('./rr serve -c .rr.silent.yaml -w tests/Functional');
+$environment->startRoadRunner(
+    rrCommand: sprintf('%s serve -c .rr.silent.yaml -w tests/Functional', $sysInfo->rrExecutable),
+);
 register_shutdown_function(fn() => $environment->stop());
 
 // Default feature flags