diff --git a/realworld/backend/config.exs b/realworld/backend/config.exs
index 2217811e25c061f37fe14f2fd5055e68fe22bc08..e79b94e277eb5c40d029a8bffc84e3fb127461bd 100644
--- a/realworld/backend/config.exs
+++ b/realworld/backend/config.exs
@@ -2,7 +2,7 @@ use Mix.Config
 
 config :real_world, RealWorldWeb.Endpoint,
   load_from_system_env: true,
-  http: [port: 80],
+  http: [port: 80, ip: {0,0,0,0}],
   url: [scheme: "http", host: "/", port: 80],
   force_ssl: [rewrite_on: [:x_forwarded_proto]],
   secret_key_base: Map.fetch!(System.get_env(), "SECRET_KEY_BASE")