diff --git a/engine/src/flutter/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart b/engine/src/flutter/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
index 8af6b3aaa55..4caf251c031 100644
--- a/engine/src/flutter/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
+++ b/engine/src/flutter/lib/web_ui/lib/src/engine/canvaskit/native_memory.dart
@@ -22,6 +22,7 @@ import 'package:ui/src/engine.dart';
 /// 6. We call `delete` on SkPaint.
 DomFinalizationRegistry _finalizationRegistry = DomFinalizationRegistry(
   (ExternalDartReference boxedUniq) {
+    // ignore: cast_nullable_to_non_nullable
     final UniqueRef<Object> uniq = boxedUniq.toDartObject as UniqueRef<Object>;
     uniq.collect();
   }.toJS
diff --git a/engine/src/flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart b/engine/src/flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart
index ef60ac0ae7c..d6d739c7376 100644
--- a/engine/src/flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart
+++ b/engine/src/flutter/lib/web_ui/lib/src/engine/skwasm/skwasm_impl/memory.dart
@@ -29,6 +29,7 @@ typedef DisposeFunction<T extends NativeType> = void Function(Pointer<T>);
 class SkwasmFinalizationRegistry<T extends NativeType> {
   SkwasmFinalizationRegistry(this.dispose)
     : registry = DomFinalizationRegistry(((ExternalDartReference address) =>
+      // ignore: cast_nullable_to_non_nullable
       dispose(Pointer<T>.fromAddress(address.toDartObject as int))
     ).toJS);