diff --git a/core/modules/file/file.module b/core/modules/file/file.module
index f31fdfa..26bbd93 100644
--- a/core/modules/file/file.module
+++ b/core/modules/file/file.module
@@ -240,7 +240,7 @@ function file_ajax_upload() {
 
   if (empty($_POST['form_build_id']) || $form_build_id != $_POST['form_build_id']) {
     // Invalid request.
-    drupal_set_message(t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', array('@size' => format_size(file_upload_max_size()))), 'error');
+    drupal_set_message(t('An unrecoverable error occurred. The submitted information does not match the generated form. Try reloading the page and submitting again.'), 'error');
     $commands = array();
     $commands[] = ajax_command_replace(NULL, theme('status_messages'));
     return array('#type' => 'ajax', '#commands' => $commands);