diff --git a/dartdoc_test/lib/src/resource.dart b/dartdoc_test/lib/src/resource.dart
index f3034d7a..abfb2425 100644
--- a/dartdoc_test/lib/src/resource.dart
+++ b/dartdoc_test/lib/src/resource.dart
@@ -24,7 +24,7 @@ import 'package:source_span/source_span.dart';
 import 'dartdoc_test.dart';
 import 'model.dart';
 
-const _testPath = '.dart_tool/dartdoc_test';
+final _testPath = p.join('.dart_tool', 'dartdoc_test');
 
 final _currentDir = Directory.current;