diff --git a/src/Illuminate/Foundation/Console/ServeCommand.php b/src/Illuminate/Foundation/Console/ServeCommand.php
index 0c9cd9f5e6b1..83b5a068a86b 100644
--- a/src/Illuminate/Foundation/Console/ServeCommand.php
+++ b/src/Illuminate/Foundation/Console/ServeCommand.php
@@ -142,12 +142,12 @@ public function handle()
      */
     protected function startProcess($hasEnvironment)
     {
-        $process = new Process($this->serverCommand(), public_path(), collect($_ENV)->mapWithKeys(function ($value, $key) use ($hasEnvironment) {
+        $process = new Process($this->serverCommand(), public_path(), collect($_ENV)->filter(function ($value, $key) use ($hasEnvironment) {
             if ($this->option('no-reload') || ! $hasEnvironment) {
-                return [$key => $value];
+                return true;
             }
 
-            return in_array($key, static::$passthroughVariables) ? [$key => $value] : [$key => false];
+            return in_array($key, static::$passthroughVariables);
         })->all());
 
         $this->trap(fn () => [SIGTERM, SIGINT, SIGHUP, SIGUSR1, SIGUSR2, SIGQUIT], function ($signal) use ($process) {