diff --git a/src/Logger.php b/src/Logger.php
index 96a0a0f..82a12b0 100644
--- a/src/Logger.php
+++ b/src/Logger.php
@@ -437,7 +437,7 @@ class Logger
                     break;
             }
         }
-        openlog($this->syslogPrefix, null, $this->syslogFacility);
+        openlog($this->syslogPrefix, LOG_PID, $this->syslogFacility);
         // Syslog display a #012 when there is a \n : remove it
         $message = str_replace("\n", "", $message);
         syslog($priority, $message);