diff --git a/config/runtime.exs b/config/runtime.exs
index 4f5bfd6..7f2dca0 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -33,13 +33,15 @@ if config_env() == :prod do
       You can generate one by calling: mix phx.gen.secret
       """
 
-  host = System.get_env("PHX_HOST") || "example.com"
+  host = System.get_env("PHX_HOST") || "localhost"
+  aux_host = System.get_env("PHX_AUX_HOST") || host
   port = String.to_integer(System.get_env("PORT") || "4000")
 
   config :chronoscope, :dns_cluster_query, System.get_env("DNS_CLUSTER_QUERY")
 
   config :chronoscope, ChronoscopeWeb.Endpoint,
     url: [host: host, port: 443, scheme: "https"],
+    check_origin: ["https://" <> host, "https://" <> aux_host],
     http: [
       # Enable IPv6 and bind on all interfaces.
       # Set it to  {0, 0, 0, 0, 0, 0, 0, 1} for local network only access.