diff --git a/src/Mailgun/Exception/HttpServerException.php b/src/Mailgun/Exception/HttpServerException.php
index 0bb3264..857b648 100644
--- a/src/Mailgun/Exception/HttpServerException.php
+++ b/src/Mailgun/Exception/HttpServerException.php
@@ -18,7 +18,7 @@ final class HttpServerException extends \RuntimeException implements Exception
 {
     public static function serverError($httpStatus = 500)
     {
-        return new self('An unexpected error occurred at Mailgun\'s servers. Try again later and contact support if the error sill exists.', $httpStatus);
+        return new self('An unexpected error occurred at Mailgun\'s servers. Try again later and contact support if the error still exists.', $httpStatus);
     }
 
     public static function networkError(\Exception $previous)