diff --git a/tests/php/RunDeleteCacheJobTest.php b/tests/php/RunDeleteCacheJobTest.php
index bfa7519f..a272be84 100644
--- a/tests/php/RunDeleteCacheJobTest.php
+++ b/tests/php/RunDeleteCacheJobTest.php
@@ -3,6 +3,7 @@
 namespace SilverStripe\StaticPublishQueue\Job;
 
 use SilverStripe\Dev\FunctionalTest;
+use SilverStripe\Subsites\State\SubsiteState;
 use Symbiote\QueuedJobs\Services\QueuedJobService;
 
 class RunDeleteCacheJobTest extends FunctionalTest
@@ -12,7 +13,14 @@ public function testHydrationAffectsSignature()
         $job = new DeleteStaticCacheJob();
         $data = $job->getJobData();
         $signature = $job->getSignature();
-        $this->assertEmpty($data->jobData);
+        if (class_exists(SubsiteState::class)) {
+            // The subsite ID is added via `AbstractQueuedJob::getJobData()`
+            // Without accounting for that, this test fails in the kitchen sink.
+            $expected = ['SubsiteID' => SubsiteState::singleton()->getSubsiteId()];
+            $this->assertSame($expected, json_decode(json_encode($data->jobData), true));
+        } else {
+            $this->assertEmpty($data->jobData);
+        }
         $this->assertFalse($data->isComplete);
 
         $job->hydrate(['/' => 1], null);