diff --git a/app/controllers/sites_controller.rb b/app/controllers/sites_controller.rb
index f8e1cb86..ee32154a 100644
--- a/app/controllers/sites_controller.rb
+++ b/app/controllers/sites_controller.rb
@@ -27,6 +27,6 @@ class SitesController < ApplicationController
 
     render file: @site.build_log,
       layout: false,
-      content_type: 'text/plain'
+      content_type: 'text/plain; charset=utf-8'
   end
 end