diff --git a/lib/Newsletter/Scheduler/AutomaticEmailScheduler.php b/lib/Newsletter/Scheduler/AutomaticEmailScheduler.php
index e8b75757f3..cba13940be 100644
--- a/lib/Newsletter/Scheduler/AutomaticEmailScheduler.php
+++ b/lib/Newsletter/Scheduler/AutomaticEmailScheduler.php
@@ -7,8 +7,18 @@ use MailPoet\Models\ScheduledTask;
 use MailPoet\Models\ScheduledTaskSubscriber;
 use MailPoet\Models\SendingQueue;
 use MailPoet\Tasks\Sending as SendingTask;
+use MailPoet\WP\Functions as WPFunctions;
 
 class AutomaticEmailScheduler {
+  /** @var WPFunctions|null */
+  private $wp;
+
+  public function __construct(
+    ?WPFunctions $wp = null
+  ) {
+    $this->wp = $wp;
+  }
+
   public function scheduleAutomaticEmail($group, $event, $schedulingCondition = false, $subscriberId = false, $meta = false) {
     $newsletters = Scheduler::getNewsletters(Newsletter::TYPE_AUTOMATIC, $group);
     if (empty($newsletters)) return false;
@@ -92,7 +102,7 @@ class AutomaticEmailScheduler {
     $sendingTask->status = SendingQueue::STATUS_SCHEDULED;
     $sendingTask->priority = SendingQueue::PRIORITY_MEDIUM;
 
-    $sendingTask->scheduledAt = Scheduler::getScheduledTimeWithDelay($newsletter->afterTimeType, $newsletter->afterTimeNumber);
+    $sendingTask->scheduledAt = Scheduler::getScheduledTimeWithDelay($newsletter->afterTimeType, $newsletter->afterTimeNumber, $this->wp);
     return $sendingTask->save();
   }
 
@@ -102,7 +112,7 @@ class AutomaticEmailScheduler {
       $sendingTask->__set('meta', $meta);
     }
     // compute new 'scheduled_at' from now
-    $sendingTask->scheduledAt = Scheduler::getScheduledTimeWithDelay($newsletter->afterTimeType, $newsletter->afterTimeNumber);
+    $sendingTask->scheduledAt = Scheduler::getScheduledTimeWithDelay($newsletter->afterTimeType, $newsletter->afterTimeNumber, $this->wp);
     $sendingTask->save();
   }
 }
diff --git a/lib/Newsletter/Scheduler/Scheduler.php b/lib/Newsletter/Scheduler/Scheduler.php
index 3fe89917c2..5bba6b71d7 100644
--- a/lib/Newsletter/Scheduler/Scheduler.php
+++ b/lib/Newsletter/Scheduler/Scheduler.php
@@ -33,8 +33,8 @@ class Scheduler {
     return $previousRunDate;
   }
 
-  public static function getScheduledTimeWithDelay($afterTimeType, $afterTimeNumber) {
-    $wp = WPFunctions::get();
+  public static function getScheduledTimeWithDelay($afterTimeType, $afterTimeNumber, $wp = null): Carbon {
+    $wp = $wp ?? WPFunctions::get();
     $currentTime = Carbon::createFromTimestamp($wp->currentTime('timestamp'));
     switch ($afterTimeType) {
       case 'minutes':
diff --git a/tests/integration/Newsletter/Scheduler/AutomaticEmailTest.php b/tests/integration/Newsletter/Scheduler/AutomaticEmailTest.php
index c565a182e8..b1b9157ef0 100644
--- a/tests/integration/Newsletter/Scheduler/AutomaticEmailTest.php
+++ b/tests/integration/Newsletter/Scheduler/AutomaticEmailTest.php
@@ -148,7 +148,6 @@ class AutomaticEmailTest extends \MailPoetTest {
 
   public function testItSchedulesAutomaticEmailWhenConditionMatches() {
     $currentTime = Carbon::createFromTimestamp(WPFunctions::get()->currentTime('timestamp'));
-    Carbon::setTestNow($currentTime); // mock carbon to return current time
     $newsletter1 = $this->_createNewsletter();
     $this->_createNewsletterOptions(
       $newsletter1->id,
@@ -175,8 +174,13 @@ class AutomaticEmailTest extends \MailPoetTest {
       return $email->sendTo === 'segment';
     };
 
+    $wpMock = $this->createMock(WPFunctions::class);
+    $wpMock->expects($this->any())
+      ->method('currentTime')
+      ->willReturn($currentTime->getTimestamp());
+    $automaticEmailScheduler = new AutomaticEmailScheduler($wpMock);
     // email should only be scheduled if it matches condition ("send to segment")
-    $this->automaticEmailScheduler->scheduleAutomaticEmail('some_group', 'some_event', $condition);
+    $automaticEmailScheduler->scheduleAutomaticEmail('some_group', 'some_event', $condition);
     $result = SendingQueue::findMany();
     expect($result)->count(1);
     expect($result[0]->newsletter_id)->equals($newsletter2->id);