diff --git a/app/post/routes.py b/app/post/routes.py
index a40a10cd..993400cb 100644
--- a/app/post/routes.py
+++ b/app/post/routes.py
@@ -224,7 +224,7 @@ def show_post(post_id: int):
                            joined_communities=joined_communities(current_user.get_id()),
                            inoculation=inoculation[randint(0, len(inoculation) - 1)]
                            )
-    response.headers.set('Vary', 'Accept, Cookie')
+    response.headers.set('Vary', 'Accept, Cookie, Accept-Language')
     return response
 
 
@@ -416,7 +416,7 @@ def continue_discussion(post_id, comment_id):
                            moderating_communities=moderating_communities(current_user.get_id()),
                            joined_communities=joined_communities(current_user.get_id()), community=post.community,
                            inoculation=inoculation[randint(0, len(inoculation) - 1)])
-    response.headers.set('Vary', 'Accept, Cookie')
+    response.headers.set('Vary', 'Accept, Cookie, Accept-Language')
     return response
 
 
diff --git a/app/utils.py b/app/utils.py
index 47feb13c..1832d1b6 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -59,7 +59,7 @@ def return_304(etag, content_type=None):
     resp = make_response('', 304)
     resp.headers.add_header('ETag', request.headers['If-None-Match'])
     resp.headers.add_header('Cache-Control', 'no-cache, max-age=600, must-revalidate')
-    resp.headers.add_header('Vary', 'Accept, Cookie')
+    resp.headers.add_header('Vary', 'Accept, Cookie, Accept-Language')
     if content_type:
         resp.headers.set('Content-Type', content_type)
     return resp