diff --git a/src/Monolog/Handler/PushoverHandler.php b/src/Monolog/Handler/PushoverHandler.php
index 6ab115c7..9917b649 100644
--- a/src/Monolog/Handler/PushoverHandler.php
+++ b/src/Monolog/Handler/PushoverHandler.php
@@ -180,6 +180,6 @@ class PushoverHandler extends SocketHandler
      */
     public function useFormattedMessage($value)
     {
-        $this->useFormattedMessage = (bool) $value;
+        $this->useFormattedMessage = (boolean) $value;
     }
 }