diff --git a/src/Illuminate/Queue/Failed/DatabaseFailedJobProvider.php b/src/Illuminate/Queue/Failed/DatabaseFailedJobProvider.php
index 404d721b58dc..c5165e470abd 100644
--- a/src/Illuminate/Queue/Failed/DatabaseFailedJobProvider.php
+++ b/src/Illuminate/Queue/Failed/DatabaseFailedJobProvider.php
@@ -49,7 +49,7 @@ public function __construct(ConnectionResolverInterface $resolver, $database, $t
      * @param  string  $connection
      * @param  string  $queue
      * @param  string  $payload
-     * @return int
+     * @return int|null
      */
     public function log($connection, $queue, $payload)
     {
diff --git a/src/Illuminate/Queue/Failed/FailedJobProviderInterface.php b/src/Illuminate/Queue/Failed/FailedJobProviderInterface.php
index d264eadb9461..75c90ee4f5a2 100644
--- a/src/Illuminate/Queue/Failed/FailedJobProviderInterface.php
+++ b/src/Illuminate/Queue/Failed/FailedJobProviderInterface.php
@@ -10,7 +10,7 @@ interface FailedJobProviderInterface
      * @param  string  $connection
      * @param  string  $queue
      * @param  string  $payload
-     * @return int
+     * @return int|null
      */
     public function log($connection, $queue, $payload);
 
diff --git a/src/Illuminate/Queue/Failed/NullFailedJobProvider.php b/src/Illuminate/Queue/Failed/NullFailedJobProvider.php
index 0a24e7a1b9f6..5f2b1ec73e01 100644
--- a/src/Illuminate/Queue/Failed/NullFailedJobProvider.php
+++ b/src/Illuminate/Queue/Failed/NullFailedJobProvider.php
@@ -10,11 +10,11 @@ class NullFailedJobProvider implements FailedJobProviderInterface
      * @param  string  $connection
      * @param  string  $queue
      * @param  string  $payload
-     * @return int
+     * @return int|null
      */
     public function log($connection, $queue, $payload)
     {
-        return -1;
+        //
     }
 
     /**