diff --git a/cli/commands/build/common.dart b/cli/commands/build/common.dart
index f6f6ad50..30906b3c 100644
--- a/cli/commands/build/common.dart
+++ b/cli/commands/build/common.dart
@@ -64,5 +64,5 @@ mixin BuildCommandCommonSteps on Command {
     );
   }
 
-  String get architecture => argResults?.option("arch") as String;
+  String get architecture => parent?.argResults?.option("arch") as String;
 }