diff --git a/includes/file.inc b/includes/file.inc
index cd9761088d8..11893402b4d 100644
--- a/includes/file.inc
+++ b/includes/file.inc
@@ -11,6 +11,13 @@ define('FILE_DOWNLOADS_PUBLIC', 1);
 define('FILE_DOWNLOADS_PRIVATE', 2);
 define('FILE_SEPARATOR', PHP_OS == 'WINNT' ? '\\' : '/');
 
+// Required for file uploads to work with PHP 4.2
+define('UPLOAD_ERR_OK', 0);
+define('UPLOAD_ERR_INI_SIZE', 1);
+define('UPLOAD_ERR_FORM_SIZE', 2);
+define('UPLOAD_ERR_PARTIAL', 3);
+define('UPLOAD_ERR_NO_FILE', 4);
+
 /**
  * Create the download path to a file.
  */