diff --git a/dwds/lib/src/debugging/instance.dart b/dwds/lib/src/debugging/instance.dart
index 75ab231ad..3d750e671 100644
--- a/dwds/lib/src/debugging/instance.dart
+++ b/dwds/lib/src/debugging/instance.dart
@@ -170,7 +170,6 @@ class InstanceHelper extends Domain {
       case RuntimeObjectKind.object:
       case RuntimeObjectKind.nativeError:
       case RuntimeObjectKind.nativeObject:
-      default:
         return await _plainInstanceFor(
           metaData,
           remoteObject,
diff --git a/dwds/lib/src/servers/extension_debugger.dart b/dwds/lib/src/servers/extension_debugger.dart
index 6c0736198..a7a2fa999 100644
--- a/dwds/lib/src/servers/extension_debugger.dart
+++ b/dwds/lib/src/servers/extension_debugger.dart
@@ -364,8 +364,6 @@ class ExtensionDebugger implements RemoteDebugger {
         return 'none';
       case PauseState.uncaught:
         return 'uncaught';
-      default:
-        throw ArgumentError('unknown state: $state');
     }
   }