diff --git a/src/Process.php b/src/Process.php
index 5fd28c1..609b99c 100644
--- a/src/Process.php
+++ b/src/Process.php
@@ -110,7 +110,7 @@ public function start(LoopInterface $loop, $interval = 0.1)
                 return;
             }
 
-            $loop->addPeriodicTimer($interval, function (TimerInterface $timer) {
+            $loop->addPeriodicTimer($this->isRunning() ? $interval : 0, function (TimerInterface $timer) {
                 if (!$this->isRunning()) {
                     $this->close();
                     $timer->cancel();