diff --git a/src/Illuminate/Console/Scheduling/CallbackEvent.php b/src/Illuminate/Console/Scheduling/CallbackEvent.php
index 10286beae449..1b54a1aaf7ec 100644
--- a/src/Illuminate/Console/Scheduling/CallbackEvent.php
+++ b/src/Illuminate/Console/Scheduling/CallbackEvent.php
@@ -60,8 +60,12 @@ public function run(Container $container)
             return;
         }
 
-        register_shutdown_function(function () {
-            $this->removeMutex();
+        $pid = getmypid();
+
+        register_shutdown_function(function () use ($pid) {
+            if ($pid === getmypid()) {
+                $this->removeMutex();
+            }
         });
 
         parent::callBeforeCallbacks($container);