diff --git a/src/serve_font.js b/src/serve_font.js
index fc93772..935703d 100644
--- a/src/serve_font.js
+++ b/src/serve_font.js
@@ -11,6 +11,8 @@ var clone = require('clone'),
 module.exports = function(options, allowedFonts) {
   var app = express().disable('x-powered-by');
 
+  var lastModified = new Date().toUTCString();
+
   var fontPath = options.paths.fonts;
 
   var getFontPbf = function(name, range, callback) {
@@ -51,6 +53,7 @@ module.exports = function(options, allowedFonts) {
         return res.status(400).send('');
       } else {
         res.header('Content-type', 'application/x-protobuf');
+        res.header('Last-Modified', lastModified);
         return res.send(concated);
       }
     });
diff --git a/src/serve_rendered.js b/src/serve_rendered.js
index 0e3e0da..cfd2f05 100644
--- a/src/serve_rendered.js
+++ b/src/serve_rendered.js
@@ -38,6 +38,8 @@ mbgl.on('message', function(e) {
 module.exports = function(options, repo, params, id) {
   var app = express().disable('x-powered-by');
 
+  var lastModified = new Date().toUTCString();
+
   var rootPath = options.paths.root;
 
   var styleFile = params.style;
@@ -289,6 +291,7 @@ module.exports = function(options, repo, params, id) {
           }
 
           res.set({
+            'Last-Modified': lastModified,
             'Content-Type': 'image/' + format
           });
           return res.status(200).send(buffer);