diff --git a/src/Monolog/Formatter/GelfMessageFormatter.php b/src/Monolog/Formatter/GelfMessageFormatter.php
index 0856f863..aa01f491 100644
--- a/src/Monolog/Formatter/GelfMessageFormatter.php
+++ b/src/Monolog/Formatter/GelfMessageFormatter.php
@@ -41,14 +41,14 @@ class GelfMessageFormatter extends NormalizerFormatter
      * Translates Monolog log levels to Graylog2 log priorities.
      */
     private $logLevels = array(
-        Logger::DEBUG     => LOG_DEBUG,
-        Logger::INFO      => LOG_INFO,
-        Logger::NOTICE    => LOG_NOTICE,
-        Logger::WARNING   => LOG_WARNING,
-        Logger::ERROR     => LOG_ERR,
-        Logger::CRITICAL  => LOG_CRIT,
-        Logger::ALERT     => LOG_ALERT,
-        Logger::EMERGENCY => LOG_EMERG,
+        Logger::DEBUG     => 7,
+        Logger::INFO      => 6,
+        Logger::NOTICE    => 5,
+        Logger::WARNING   => 4,
+        Logger::ERROR     => 3,
+        Logger::CRITICAL  => 2,
+        Logger::ALERT     => 1,
+        Logger::EMERGENCY => 0,
     );
 
     public function __construct($systemName = null, $extraPrefix = null, $contextPrefix = 'ctxt_')