Fix a missed static error
diff --git a/test/selectors/level1_lib.dart b/test/selectors/level1_lib.dart
index 2e2babb..65f1468 100644
--- a/test/selectors/level1_lib.dart
+++ b/test/selectors/level1_lib.dart
@@ -96,7 +96,7 @@
 void verifyStaticList(String type, dynamic root) {
   List pre;
   List post;
-  int preLength;
+  late int preLength;
 
   runTest(() {
     pre = root.querySelectorAll('div') as List;