diff --git a/Service/Abstracts/AbstractGearmanService.php b/Service/Abstracts/AbstractGearmanService.php
index 6ae260c..f3dc768 100644
--- a/Service/Abstracts/AbstractGearmanService.php
+++ b/Service/Abstracts/AbstractGearmanService.php
@@ -39,7 +39,7 @@ public function __construct(GearmanCacheWrapper $gearmanCacheWrapper, array $def
         $this->workers = $gearmanCacheWrapper->getWorkers();
 
         if (isset($defaultSettings['job_prefix'])) {
-            $this->jobPrefix = $defaultSettings['job_prefix']??null;
+            $this->jobPrefix = $defaultSettings['job_prefix'];
         }
     }