diff --git a/config/runtime.exs b/config/runtime.exs
index 09045df3..e6c8ff6c 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -153,7 +153,9 @@ if System.get_env("DATABASE_IPV6") == "true" do
 end
 
 config :teslamate, TeslaMateWeb.Endpoint,
-  http: Util.choose_http_binding_address(),
+  http:
+    Util.choose_http_binding_address()
+    |> Keyword.merge(protocol_options: [max_header_value_length: 16384]),
   url: [
     host: System.get_env("VIRTUAL_HOST", "localhost"),
     path: System.get_env("URL_PATH", "/"),