diff --git a/bin/main.dart b/bin/main.dart
index b933a9b..d76afbd 100644
--- a/bin/main.dart
+++ b/bin/main.dart
@@ -9,9 +9,9 @@ import "package:shelf_router/shelf_router.dart";
 
 void main(List<String> argsRaw) async {
   final parser = ConfigParser()
-    ..addOption("socket", abbr: "s")
-    ..addOption("authUri", abbr: "a")
-    ..addOption("minioUri", abbr: "m");
+    ..addOption("socket", abbr: "s", mandatory: true)
+    ..addOption("authUri", abbr: "a", mandatory: true)
+    ..addOption("minioUri", abbr: "m", mandatory: true);
 
   final args = parser.parse(argsRaw);
   final settings = Settings.fromJson(<String, dynamic>{