diff --git a/LanguageFeatures/Super-parameters/type_inference_A05_t03.dart b/LanguageFeatures/Super-parameters/type_inference_A05_t03.dart
index fb6d01b..5a91391 100644
--- a/LanguageFeatures/Super-parameters/type_inference_A05_t03.dart
+++ b/LanguageFeatures/Super-parameters/type_inference_A05_t03.dart
@@ -28,7 +28,7 @@
 
 class C extends S {
   int c1;
-  C(this.c1, [int super.s1, int x, int super.s2]);
+  C(this.c1, [int super.s1, int x = 0, int super.s2]);
 }
 
 main() {