diff --git a/src/Command/ParallelCommand.php b/src/Command/ParallelCommand.php
index e75bd81..07e9b92 100644
--- a/src/Command/ParallelCommand.php
+++ b/src/Command/ParallelCommand.php
@@ -143,6 +143,7 @@ private function doExecute(InputInterface $input,
         /**
          * @var Processes $processes
          */
+        $processes->cleanUP(); //it is not getting called with -p1 after the last process otherwise
         $processes->wait(function() use ($progressBar, $queue, $processes) {
             $progressBar->renderBody($queue, $processes);
         });