diff --git a/fork.php b/fork.php
index 2292e9a..e866c7a 100644
--- a/fork.php
+++ b/fork.php
@@ -20,6 +20,7 @@ class fork
       throw new \Exception ("Can't fork as PHP doesn't have the pcntl_fork",
         500);
     declare (ticks=1);
+    @pcntl_async_signals (true);
   }
 
   /** Return the number of active PID