diff --git a/lib/pleroma/reverse_proxy.ex b/lib/pleroma/reverse_proxy.ex
index 86680294a..51f9609cb 100644
--- a/lib/pleroma/reverse_proxy.ex
+++ b/lib/pleroma/reverse_proxy.ex
@@ -9,7 +9,7 @@ defmodule Pleroma.ReverseProxy do
   @resp_cache_headers ~w(etag date last-modified)
   @keep_resp_headers @resp_cache_headers ++
                        ~w(content-length content-type content-disposition content-encoding) ++
-                       ~w(content-range accept-ranges vary)
+                       ~w(content-range accept-ranges vary expires)
   @default_cache_control_header "public, max-age=1209600"
   @valid_resp_codes [200, 206, 304]
   @max_read_duration :timer.seconds(30)