diff --git a/.do/run-background-tasks.php b/.do/run-background-tasks.php
index aa6d12d4..fdd75a3f 100644
--- a/.do/run-background-tasks.php
+++ b/.do/run-background-tasks.php
@@ -7,8 +7,6 @@
 
 require __DIR__ . '/../vendor/autoload.php';
 
-$drush = \realpath(__DIR__ . '/../vendor/bin/drush');
-
 /** @var \React\EventLoop\LoopInterface */
 $loop = Loop::get();
 
@@ -18,29 +16,29 @@
 });
 
 // Run cron every 15 minutes.
-$loop->addPeriodicTimer(900, function() use ($drush): void {
-  (new WorkerProcess($drush . ' cron'))->start();
+$loop->addPeriodicTimer(900, function(): void {
+  (new WorkerProcess('drush cron'))->start();
 });
 
 // Every 5 minutes, process jobs from the image style warmer.
-$loop->addPeriodicTimer(300, function() use ($drush): void {
+$loop->addPeriodicTimer(300, function(): void {
   (new WorkerProcess(
-    $drush . ' queue:process image_style_warmer_pregenerator'
+    'drush queue:process image_style_warmer_pregenerator'
   ))->start();
 });
 
 // Every 10 minutes, enqueue and process the warmer queue.
-$loop->addPeriodicTimer(600, function() use ($drush, $loop): void {
+$loop->addPeriodicTimer(600, function() use ($loop): void {
 
-  $loop->futureTick(function() use ($drush): void {
-    (new WorkerProcess($drush . ' warmer:enqueue ' . \implode(',', [
+  $loop->futureTick(function(): void {
+    (new WorkerProcess('drush warmer:enqueue ' . \implode(',', [
       'omnipedia_wiki_node_changes',
       'omnipedia_wiki_node_cdn',
     ])))->start();
   });
 
-  $loop->futureTick(function() use ($drush): void {
-    (new WorkerProcess($drush . ' queue:process warmer'))->start();
+  $loop->futureTick(function(): void {
+    (new WorkerProcess('drush queue:process warmer'))->start();
   });
 
 });