diff --git a/src/Composer/Command/ValidateCommand.php b/src/Composer/Command/ValidateCommand.php
index 10975afc8..623304bfa 100644
--- a/src/Composer/Command/ValidateCommand.php
+++ b/src/Composer/Command/ValidateCommand.php
@@ -125,8 +125,7 @@ EOT
         }
 
         $messages = array(
-            'error' => $errors,
-            'error' => $publishErrors,
+            'error' => array_merge($errors, $publishErrors),
             'warning' => $warnings,
         );