diff --git a/HISTORY.md b/HISTORY.md
index 33164ff..048c762 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -2,6 +2,7 @@
 ===================
 
 * Changes from 1.16.0
+* In the next major version, headers will no longer be overwritten when redirecting a directory.
 
 2.0.0 / 2024-08-23
 ==================
diff --git a/index.js b/index.js
index a7d0083..b7e3530 100644
--- a/index.js
+++ b/index.js
@@ -15,6 +15,7 @@
 
 var encodeUrl = require('encodeurl')
 var escapeHtml = require('escape-html')
+const deprecate = require('depd')('serve-static')
 var parseUrl = require('parseurl')
 var resolve = require('path').resolve
 var send = require('send')
@@ -213,7 +214,9 @@ function createRedirectDirectoryListener () {
  */
 
 function setHeaderIfNotSet (res, name, value) {
-  if (!res.hasHeader(name)) {
-    res.setHeader(name, value)
+  if (res.hasHeader(name)) {
+    deprecate('The headers will not be overwritten in the next version')
   }
+
+  res.setHeader(name, value)
 }
diff --git a/package.json b/package.json
index a0b23d5..e6679b9 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "encodeurl": "^2.0.0",
     "escape-html": "^1.0.3",
     "parseurl": "^1.3.3",
+    "depd": "^2.0.0",
     "send": "^1.0.0"
   },
   "devDependencies": {