diff --git a/phpstan.el b/phpstan.el
index ad76ab8..2e962a1 100644
--- a/phpstan.el
+++ b/phpstan.el
@@ -244,7 +244,7 @@ it returns the value of `SOURCE' as it is."
 (defun phpstan-get-command-args ()
   "Return command line argument for PHPStan."
   (let ((executable (phpstan-get-executable))
-        (args (list "analyze" "--errorFormat=raw" "--no-progress" "--no-interaction"))
+        (args (list "analyze" "--error-format=raw" "--no-progress" "--no-interaction"))
         (path (phpstan-normalize-path (phpstan-get-config-file)))
         (level (phpstan-get-level)))
     (when path