diff --git a/models/classes/taskQueue/Queue.php b/models/classes/taskQueue/Queue.php
index 2feeb3020e..20eb42d99d 100644
--- a/models/classes/taskQueue/Queue.php
+++ b/models/classes/taskQueue/Queue.php
@@ -203,10 +203,8 @@ public function acknowledge(TaskInterface $task)
 
     /**
      * Count of messages in the queue.
-     *
-     * @return int
      */
-    public function count()
+    public function count(): int
     {
         return $this->getBroker()->count();
     }
diff --git a/test/unit/model/taskQueue/QueueTest.php b/test/unit/model/taskQueue/QueueTest.php
index 0b9791f56f..f44fd53c5a 100644
--- a/test/unit/model/taskQueue/QueueTest.php
+++ b/test/unit/model/taskQueue/QueueTest.php
@@ -223,7 +223,7 @@ public function testCountShouldCallCountOnBroker()
         $queueBrokerMock = $this->getMockForAbstractClass(QueueBrokerInterface::class);
 
         $queueBrokerMock->expects($this->once())
-            ->method('count');
+            ->method('count')->willReturn(1);
 
         /** @var Queue|MockObject $queueMock */
         $queueMock = $this->getMockBuilder(Queue::class)