diff --git a/tests/BatchedProcessorTest.php b/tests/BatchedProcessorTest.php
index c820987..77cf615 100644
--- a/tests/BatchedProcessorTest.php
+++ b/tests/BatchedProcessorTest.php
@@ -56,6 +56,8 @@ class BatchedProcessorTest extends SapphireTest
             $this->markTestSkipped("These tests need the QueuedJobs module installed to run");
         }
 
+        Config::modify()->set(QueuedJobService::class, 'use_shutdown_function', false);
+
         if (class_exists('Subsite')) {
             $this->skipTest = true;
             $this->markTestSkipped(get_class() . ' skipped when running with subsites');
diff --git a/tests/SolrReindexQueuedTest.php b/tests/SolrReindexQueuedTest.php
index 2dda3a1..1328692 100644
--- a/tests/SolrReindexQueuedTest.php
+++ b/tests/SolrReindexQueuedTest.php
@@ -58,6 +58,8 @@ class SolrReindexQueuedTest extends SapphireTest
             return $this->markTestSkipped("These tests need the QueuedJobs module installed to run");
         }
 
+        Config::modify()->set(QueuedJobService::class, 'use_shutdown_function', false);
+
         // Set queued handler for reindex
         Config::modify()->set(Injector::class, SolrReindexHandler::class, array(
             'class' => SolrReindexQueuedHandler::class