diff --git a/test/Connection/Http1ConnectionTest.php b/test/Connection/Http1ConnectionTest.php
index 87e35e44..07458e8e 100644
--- a/test/Connection/Http1ConnectionTest.php
+++ b/test/Connection/Http1ConnectionTest.php
@@ -146,7 +146,7 @@ public function testUpgrade(): void
     public function testTransferTimeout(): void
     {
         $this->setMinimumRuntime(0.5);
-        $this->setTimeout(0.6);
+        $this->setTimeout(1);
 
         [$server, $client] = Socket\createSocketPair();