diff --git a/dart/lib/src/scope.dart b/dart/lib/src/scope.dart
index b62632f525..e4a9c96e64 100644
--- a/dart/lib/src/scope.dart
+++ b/dart/lib/src/scope.dart
@@ -416,7 +416,7 @@ class Scope {
 
     final tags = List.from(_tags.keys);
     for (final tag in tags) {
-      final value = tags[tag];
+      final value = _tags[tag];
       if (value != null) {
         clone._setTagSync(tag, value);
       }