diff --git a/tool/export_api_contract.dart b/tool/export_api_contract.dart
index 55e4e8a2..2c5eee43 100644
--- a/tool/export_api_contract.dart
+++ b/tool/export_api_contract.dart
@@ -80,7 +80,7 @@ void main(List<String> args) {
   final sorted = <String, Map<String, dynamic>>{
     for (final key in contract.keys.toList()..sort()) key: contract[key]!,
   };
-  final encoder = const JsonEncoder.withIndent('  ');
+  const encoder = JsonEncoder.withIndent('  ');
   final output = encoder.convert(sorted);
 
   if (args.isNotEmpty) {