diff --git a/mailpoet/lib/Newsletter/Sending/ScheduledTasksRepository.php b/mailpoet/lib/Newsletter/Sending/ScheduledTasksRepository.php
index 08b9f6bc9a..8ff1889bbc 100644
--- a/mailpoet/lib/Newsletter/Sending/ScheduledTasksRepository.php
+++ b/mailpoet/lib/Newsletter/Sending/ScheduledTasksRepository.php
@@ -239,7 +239,7 @@ class ScheduledTasksRepository extends Repository {
   /**
    * @return ScheduledTaskEntity[]
    */
-  public function findScheduledSendingTasks(int $limit): array {
+  public function findScheduledSendingTasks(?int $limit = null): array {
     $now = Carbon::createFromTimestamp($this->wp->currentTime('timestamp'));
     return $this->doctrineRepository->createQueryBuilder('st')
       ->select('st')
diff --git a/mailpoet/tests/integration/Newsletter/Sending/ScheduledTasksRepositoryTest.php b/mailpoet/tests/integration/Newsletter/Sending/ScheduledTasksRepositoryTest.php
index 6abe4ec900..cd56b27f5e 100644
--- a/mailpoet/tests/integration/Newsletter/Sending/ScheduledTasksRepositoryTest.php
+++ b/mailpoet/tests/integration/Newsletter/Sending/ScheduledTasksRepositoryTest.php
@@ -198,7 +198,7 @@ class ScheduledTasksRepositoryTest extends \MailPoetTest {
     $task = $this->scheduledTaskFactory->create(SendingQueueWorker::TASK_TYPE, ScheduledTaskEntity::STATUS_SCHEDULED, Carbon::now()->addDay());
     $this->sendingQueueFactory->create($task);
 
-    $tasks = $this->repository->findScheduledSendingTasks(5);
+    $tasks = $this->repository->findScheduledSendingTasks();
     $this->assertSame($expectedResult, $tasks);
   }
 
diff --git a/mailpoet/tests/integration/Tasks/SendingTest.php b/mailpoet/tests/integration/Tasks/SendingTest.php
index 27eaeb348c..354a9ea0ee 100644
--- a/mailpoet/tests/integration/Tasks/SendingTest.php
+++ b/mailpoet/tests/integration/Tasks/SendingTest.php
@@ -157,7 +157,7 @@ class SendingTest extends \MailPoetTest {
     $this->sending->status = ScheduledTask::STATUS_SCHEDULED;
     $this->sending->scheduled_at = Carbon::createFromTimestamp(WPFunctions::get()->currentTime('timestamp'))->subHours(1);
     $this->sending->save();
-    $tasks = $this->scheduledTaskRepository->findScheduledSendingTasks(5);
+    $tasks = $this->scheduledTaskRepository->findScheduledSendingTasks();
     expect($tasks)->notEmpty();
     foreach ($tasks as $task) {
       expect($task)->isInstanceOf(ScheduledTaskEntity::class);
@@ -181,7 +181,7 @@ class SendingTest extends \MailPoetTest {
   public function testItDoesNotGetPaused() {
     $this->_after();
     $this->createNewSendingTask(['status' => ScheduledTask::STATUS_PAUSED]);
-    expect($this->scheduledTaskRepository->findScheduledSendingTasks(5))->count(0);
+    expect($this->scheduledTaskRepository->findScheduledSendingTasks())->count(0);
   }
 
   public function testItGetsRunningQueues() {