diff --git a/internal/domain/config.go b/internal/domain/config.go
index b03f6fc..d74875b 100644
--- a/internal/domain/config.go
+++ b/internal/domain/config.go
@@ -7,7 +7,7 @@ import (
 
 type Config struct {
 	BaseURL *url.URL `env:"BASE_URL" envDefault:"http://localhost:3000/"`
-	Bind    string   `end:"BIND" envDefault:":3000"`
+	Bind    string   `end:"BIND,required" envDefault:":3000"`
 	Name    string   `env:"NAME" envDefault:"WebSub"`
 }
 
diff --git a/main.go b/main.go
index 244b11f..882729d 100644
--- a/main.go
+++ b/main.go
@@ -56,7 +56,11 @@ func main() {
 	ctx := context.Background()
 
 	config := new(domain.Config)
-	if err := env.Parse(config, env.Options{Prefix: "HUB_"}); err != nil {
+	if err := env.Parse(config, env.Options{
+		Prefix:                "HUB_",
+		TagName:               "env",
+		UseFieldNameByDefault: true,
+	}); err != nil {
 		logger.Fatalln(err)
 	}