diff --git a/src/Illuminate/Queue/Jobs/DatabaseJob.php b/src/Illuminate/Queue/Jobs/DatabaseJob.php
index 8fdb41801752..5a5644c499e7 100644
--- a/src/Illuminate/Queue/Jobs/DatabaseJob.php
+++ b/src/Illuminate/Queue/Jobs/DatabaseJob.php
@@ -78,7 +78,7 @@ public function attempts()
     /**
      * Get the job identifier.
      *
-     * @return string
+     * @return string|int
      */
     public function getJobId()
     {
diff --git a/src/Illuminate/Queue/Jobs/Job.php b/src/Illuminate/Queue/Jobs/Job.php
index 0dee23712fa9..8ec6ac54f805 100755
--- a/src/Illuminate/Queue/Jobs/Job.php
+++ b/src/Illuminate/Queue/Jobs/Job.php
@@ -67,7 +67,7 @@ abstract class Job
     /**
      * Get the job identifier.
      *
-     * @return string
+     * @return string|int|null
      */
     abstract public function getJobId();