diff --git a/pkg/dart2js_info/lib/info.dart b/pkg/dart2js_info/lib/info.dart
index 55c3c50..ef0c1a5 100644
--- a/pkg/dart2js_info/lib/info.dart
+++ b/pkg/dart2js_info/lib/info.dart
@@ -334,7 +334,7 @@
   late final bool isConst;
 
   /// When [isConst] is true, the constant initializer expression.
-  late final ConstantInfo initializer;
+  ConstantInfo? initializer;
 
   FieldInfo(
       {required String name,