diff --git a/tests/sample/Compute/v2/VolumeAttachmentTest.php b/tests/sample/Compute/v2/VolumeAttachmentTest.php
index 17361b3c..47958a6e 100644
--- a/tests/sample/Compute/v2/VolumeAttachmentTest.php
+++ b/tests/sample/Compute/v2/VolumeAttachmentTest.php
@@ -70,7 +70,7 @@ public function testDetach(VolumeAttachment $createdVolumeAttachment)
         // let's wait for the server to be completely up
         // https://bugs.launchpad.net/nova/+bug/1998148
         // https://bugs.launchpad.net/nova/+bug/1960346
-        sleep(15);
+        sleep(30);
 
         require_once $this->sampleFile(
             'volume_attachments/delete.php',