diff --git a/pkg/dartdev/lib/src/commands/compile.dart b/pkg/dartdev/lib/src/commands/compile.dart
index 437b941f639..e22e4dbce0f 100644
--- a/pkg/dartdev/lib/src/commands/compile.dart
+++ b/pkg/dartdev/lib/src/commands/compile.dart
@@ -127,6 +127,9 @@ class CompileSnapshotCommand extends CompileSubcommandCommand {
         abbr: defineOption.abbr,
         valueHelp: defineOption.valueHelp,
       )
+      ..addFlag('sound-null-safety',
+          help: 'Respect the nullability of types at runtime.',
+          defaultsTo: null)
       ..addExperimentalFlags(verbose: verbose);
   }
 
@@ -183,6 +186,11 @@ class CompileSnapshotCommand extends CompileSubcommandCommand {
     buildArgs.add('--snapshot-kind=$formatName');
     buildArgs.add('--snapshot=${path.canonicalize(outputFile)}');
 
+    final bool? soundNullSafety = args['sound-null-safety'];
+    if (soundNullSafety != null) {
+      buildArgs.add('--${soundNullSafety ? '' : 'no-'}sound-null-safety');
+    }
+
     final String? packages = args[packagesOption.flag];
     if (packages != null) {
       buildArgs.add('--packages=$packages');
diff --git a/pkg/dartdev/test/commands/compile_test.dart b/pkg/dartdev/test/commands/compile_test.dart
index 11deb0ec85e..dab7120ee55 100644
--- a/pkg/dartdev/test/commands/compile_test.dart
+++ b/pkg/dartdev/test/commands/compile_test.dart
@@ -962,6 +962,56 @@ void main() {}
         reason: 'File not found: $outFile');
   });
 
+  test('Compile kernel with --sound-null-safety', () async {
+    final p = project(mainSrc: '''void main() {
+      print((<int?>[] is List<int>) ? 'oh no' : 'sound');
+    }''');
+    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
+    final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
+
+    var result = await p.run(
+      [
+        'compile',
+        'kernel',
+        '--sound-null-safety',
+        '-o',
+        outFile,
+        inFile,
+      ],
+    );
+
+    expect(result.stderr, isEmpty);
+    expect(result.stdout, contains(soundNullSafetyMessage));
+    expect(result.exitCode, 0);
+    expect(File(outFile).existsSync(), true,
+        reason: 'File not found: $outFile');
+  });
+
+  test('Compile kernel with --no-sound-null-safety', () async {
+    final p = project(mainSrc: '''void main() {
+      print((<int?>[] is List<int>) ? 'unsound' : 'oh no');
+    }''');
+    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
+    final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
+
+    var result = await p.run(
+      [
+        'compile',
+        'kernel',
+        '--no-sound-null-safety',
+        '-o',
+        outFile,
+        inFile,
+      ],
+    );
+
+    expect(result.stderr, isEmpty);
+    expect(result.stdout, isNot(contains(soundNullSafetyMessage)));
+    expect(result.exitCode, 0);
+    expect(File(outFile).existsSync(), true,
+        reason: 'File not found: $outFile');
+  });
+
   test('Compile kernel without info', () async {
     final p = project(mainSrc: '''void main() {}''');
     final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
@@ -1085,6 +1135,56 @@ void main() {}
         reason: 'File not found: $outFile');
   });
 
+  test('Compile JIT snapshot with --sound-null-safety', () async {
+    final p = project(mainSrc: '''void main() {
+      print((<int?>[] is List<int>) ? 'oh no' : 'sound');
+    }''');
+    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
+    final outFile = path.canonicalize(path.join(p.dirPath, 'myjit'));
+
+    var result = await p.run(
+      [
+        'compile',
+        'jit-snapshot',
+        '--sound-null-safety',
+        '-o',
+        outFile,
+        inFile,
+      ],
+    );
+
+    expect(result.stderr, isEmpty);
+    expect(result.stdout, contains(soundNullSafetyMessage));
+    expect(result.exitCode, 0);
+    expect(File(outFile).existsSync(), true,
+        reason: 'File not found: $outFile');
+  });
+
+  test('Compile JIT snapshot with --no-sound-null-safety', () async {
+    final p = project(mainSrc: '''void main() {
+      print((<int?>[] is List<int>) ? 'unsound' : 'oh no');
+    }''');
+    final inFile = path.canonicalize(path.join(p.dirPath, p.relativeFilePath));
+    final outFile = path.canonicalize(path.join(p.dirPath, 'mydill'));
+
+    var result = await p.run(
+      [
+        'compile',
+        'jit-snapshot',
+        '--no-sound-null-safety',
+        '-o',
+        outFile,
+        inFile,
+      ],
+    );
+
+    expect(result.stderr, isEmpty);
+    expect(result.stdout, isNot(contains(soundNullSafetyMessage)));
+    expect(result.exitCode, 0);
+    expect(File(outFile).existsSync(), true,
+        reason: 'File not found: $outFile');
+  });
+
   test('Compile JIT snapshot with training args', () async {
     final p =
         project(mainSrc: '''void main(List<String> args) => print(args);''');