Fixed Issue #465: type corrected.
diff --git a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart
index 0065c0b..dacd65d 100644
--- a/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart
+++ b/LanguageFeatures/nnbd/override_checking_A01_RETURN_t09.dart
@@ -30,7 +30,7 @@
   Function getFunction() => testme1;
   FutureOr getFutureOr() => 1;
   dynamic  getDynamic()  => 1;
-  Null     getNull()     => 1;
+  Null     getNull()     => Null;
 }
 
 main() {