diff --git a/django/middleware/locale.py b/django/middleware/locale.py
index 35128f7376..76d026f9f7 100644
--- a/django/middleware/locale.py
+++ b/django/middleware/locale.py
@@ -1,5 +1,6 @@
 "this is the locale selecting middleware that will look at accept headers"
 
+from django.utils.cache import patch_vary_headers
 from django.utils import translation
 
 # this is a cache that will build a map from modules to applications
@@ -38,3 +39,7 @@ class LocaleMiddleware:
 
         translation.activate(app, lang)
 
+    def process_response(self, request, response):
+        patch_vary_headers(response, ('Accept-Language',))
+        return response
+