diff --git a/compose.yaml b/compose.yaml
index 0459695d..c92182d2 100644
--- a/compose.yaml
+++ b/compose.yaml
@@ -21,7 +21,6 @@ services:
       - LOGIN_PASSWORD
       - MIX_ENV
       - OPENAI_KEY
-      - PHX_HOST
       - POOL_SIZE
       - PORT
       - SECRET_KEY_BASE
diff --git a/config/runtime.exs b/config/runtime.exs
index 41465f52..d2610e31 100644
--- a/config/runtime.exs
+++ b/config/runtime.exs
@@ -136,7 +136,7 @@ if config_env() == :prod do
       environment variable API_TOKEN is missing.
       """
 
-  host = System.get_env("PHX_HOST") || "example.com"
+  host = System.get_env("SERVICE_FQDN_WEB") || "example.com"
   port = String.to_integer(System.get_env("PORT") || "4000")
 
   config :music_library, MusicLibraryWeb, login_password: login_password, api_token: api_token