diff --git a/Command/ConsumeMessagesCommand.php b/Command/ConsumeMessagesCommand.php
index f430a28..9746c5e 100644
--- a/Command/ConsumeMessagesCommand.php
+++ b/Command/ConsumeMessagesCommand.php
@@ -258,7 +258,7 @@ public function complete(CompletionInput $input, CompletionSuggestions $suggesti
 
     public function getSubscribedSignals(): array
     {
-        return $this->signals ?? (\defined('SIGTERM') ? [\SIGTERM, \SIGINT] : []);
+        return $this->signals ?? (\extension_loaded('pcntl') ? [\SIGTERM, \SIGINT] : []);
     }
 
     public function handleSignal(int $signal, int|false $previousExitCode = 0): int|false
diff --git a/Command/FailedMessagesRetryCommand.php b/Command/FailedMessagesRetryCommand.php
index ae47d77..53e70bb 100644
--- a/Command/FailedMessagesRetryCommand.php
+++ b/Command/FailedMessagesRetryCommand.php
@@ -134,7 +134,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
     public function getSubscribedSignals(): array
     {
-        return $this->signals ?? (\defined('SIGTERM') ? [\SIGTERM, \SIGINT] : []);
+        return $this->signals ?? (\extension_loaded('pcntl') ? [\SIGTERM, \SIGINT] : []);
     }
 
     public function handleSignal(int $signal, int|false $previousExitCode = 0): int|false
diff --git a/EventListener/StopWorkerOnSignalsListener.php b/EventListener/StopWorkerOnSignalsListener.php
index 6641d41..54f93ae 100644
--- a/EventListener/StopWorkerOnSignalsListener.php
+++ b/EventListener/StopWorkerOnSignalsListener.php
@@ -29,7 +29,7 @@ class StopWorkerOnSignalsListener implements EventSubscriberInterface
 
     public function __construct(array $signals = null, LoggerInterface $logger = null)
     {
-        if (null === $signals && \defined('SIGTERM')) {
+        if (null === $signals && \extension_loaded('pcntl')) {
             $signals = [\SIGTERM, \SIGINT];
         }
         $this->signals = $signals ?? [];
diff --git a/EventListener/StopWorkerOnSigtermSignalListener.php b/EventListener/StopWorkerOnSigtermSignalListener.php
index 4f76b1e..2d7c8f1 100644
--- a/EventListener/StopWorkerOnSigtermSignalListener.php
+++ b/EventListener/StopWorkerOnSigtermSignalListener.php
@@ -25,6 +25,6 @@ class StopWorkerOnSigtermSignalListener extends StopWorkerOnSignalsListener
 {
     public function __construct(LoggerInterface $logger = null)
     {
-        parent::__construct(\defined('SIGTERM') ? [\SIGTERM] : [], $logger);
+        parent::__construct(\extension_loaded('pcntl') ? [\SIGTERM] : [], $logger);
     }
 }