diff --git a/lib/dev.js b/lib/dev.js
index fb7332e..806101c 100644
--- a/lib/dev.js
+++ b/lib/dev.js
@@ -248,11 +248,27 @@ export default async function createServer(root = '', conf = {}) {
 
           default:
             res.setHeader('content-type', MIME_TYPES[ext] || MIME_TYPES.other)
+            let pub_file = join(PUBLIC_DIR, pathname)
+            let source_file = join(SOURCE_DIR, pathname)
 
-            if (fs.isfile(join(PUBLIC_DIR, pathname))) {
-              code = fs.cat(join(PUBLIC_DIR, pathname))
-            } else if (fs.isfile(join(SOURCE_DIR, pathname))) {
-              code = fs.cat(join(SOURCE_DIR, pathname))
+            if (fs.isfile(pub_file)) {
+              code = fs.cat(pub_file)
+              if (code) {
+                let stat = fs.stat(pub_file)
+                res.setHeader(
+                  'Last-Modified',
+                  new Date(stat.mtime).toGMTString()
+                )
+              }
+            } else if (fs.isfile(source_file)) {
+              code = fs.cat(source_file)
+              if (code) {
+                let stat = fs.stat(source_file)
+                res.setHeader(
+                  'Last-Modified',
+                  new Date(stat.mtime).toGMTString()
+                )
+              }
             } else {
               code = null
             }
diff --git a/package.json b/package.json
index 45bfbdd..5f359b1 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "fite",
   "type": "module",
-  "version": "0.7.3",
+  "version": "0.7.4",
   "bin": {
     "fite": "index.js"
   },