diff --git a/packages/flutter_tools/lib/src/build_system/targets/web.dart b/packages/flutter_tools/lib/src/build_system/targets/web.dart
index 2b66ffaf5b2..f9c240f34b0 100644
--- a/packages/flutter_tools/lib/src/build_system/targets/web.dart
+++ b/packages/flutter_tools/lib/src/build_system/targets/web.dart
@@ -258,6 +258,7 @@ class Dart2WasmTarget extends Dart2WebTarget {
       decodeDartDefines(environment.defines, kDartDefines),
     );
 
+    assert(buildMode == BuildMode.release || buildMode == BuildMode.profile);
     final List<String> compilationArgs = <String>[
       artifacts.getArtifactPath(Artifact.engineDartBinary, platform: TargetPlatform.web_javascript),
       'compile',
@@ -265,6 +266,8 @@ class Dart2WasmTarget extends Dart2WebTarget {
       '--packages=.dart_tool/package_config.json',
       '--extra-compiler-option=--dart-sdk=$dartSdkPath',
       '--extra-compiler-option=--platform=$platformFilePath',
+      '--extra-compiler-option=--delete-tostring-package-uri=dart:ui',
+      '--extra-compiler-option=--delete-tostring-package-uri=package:flutter',
       if (compilerConfig.renderer == WebRendererMode.skwasm) ...<String>[
         '--extra-compiler-option=--import-shared-memory',
         '--extra-compiler-option=--shared-memory-max-pages=32768',
diff --git a/packages/flutter_tools/lib/src/compile.dart b/packages/flutter_tools/lib/src/compile.dart
index 15d209367f1..1a68a4d3092 100644
--- a/packages/flutter_tools/lib/src/compile.dart
+++ b/packages/flutter_tools/lib/src/compile.dart
@@ -183,11 +183,15 @@ List<String> buildModeOptions(BuildMode mode, List<String> dartDefines) =>
             '-Ddart.vm.profile=true',
           if (!dartDefines.any((String define) => define.startsWith('dart.vm.product')))
             '-Ddart.vm.product=false',
+          '--delete-tostring-package-uri=dart:ui',
+          '--delete-tostring-package-uri=package:flutter',
           ...kDartCompilerExperiments,
         ],
       BuildMode.release => <String>[
           '-Ddart.vm.profile=false',
           '-Ddart.vm.product=true',
+          '--delete-tostring-package-uri=dart:ui',
+          '--delete-tostring-package-uri=package:flutter',
           ...kDartCompilerExperiments,
         ],
       _ => throw Exception('Unknown BuildMode: $mode')
diff --git a/packages/flutter_tools/test/general.shard/build_system/targets/web_test.dart b/packages/flutter_tools/test/general.shard/build_system/targets/web_test.dart
index 4c2bd93d438..4b39bf6e48d 100644
--- a/packages/flutter_tools/test/general.shard/build_system/targets/web_test.dart
+++ b/packages/flutter_tools/test/general.shard/build_system/targets/web_test.dart
@@ -36,6 +36,8 @@ const List<String> _kDart2WasmLinuxArgs = <String> [
   '--packages=.dart_tool/package_config.json',
   '--extra-compiler-option=--dart-sdk=Artifact.engineDartSdkPath.TargetPlatform.web_javascript',
   '--extra-compiler-option=--platform=HostArtifact.webPlatformKernelFolder/dart2wasm_platform.dill',
+  '--extra-compiler-option=--delete-tostring-package-uri=dart:ui',
+  '--extra-compiler-option=--delete-tostring-package-uri=package:flutter',
 ];
 
 void main() {
diff --git a/packages/flutter_tools/test/general.shard/compile_batch_test.dart b/packages/flutter_tools/test/general.shard/compile_batch_test.dart
index 9d2ad2a8868..9d0ee764e30 100644
--- a/packages/flutter_tools/test/general.shard/compile_batch_test.dart
+++ b/packages/flutter_tools/test/general.shard/compile_batch_test.dart
@@ -200,6 +200,8 @@ void main() {
           '--no-print-incremental-dependencies',
           '-Ddart.vm.profile=true',
           '-Ddart.vm.product=false',
+          '--delete-tostring-package-uri=dart:ui',
+          '--delete-tostring-package-uri=package:flutter',
           '--no-link-platform',
           '--aot',
           '--tfa',
@@ -248,6 +250,8 @@ void main() {
           '--no-print-incremental-dependencies',
           '-Ddart.vm.profile=false',
           '-Ddart.vm.product=true',
+          '--delete-tostring-package-uri=dart:ui',
+          '--delete-tostring-package-uri=package:flutter',
           '--no-link-platform',
           '--aot',
           '--tfa',
diff --git a/packages/flutter_tools/test/general.shard/compile_test.dart b/packages/flutter_tools/test/general.shard/compile_test.dart
index 28442b625bf..a0db3b8d604 100644
--- a/packages/flutter_tools/test/general.shard/compile_test.dart
+++ b/packages/flutter_tools/test/general.shard/compile_test.dart
@@ -105,11 +105,15 @@ void main() {
   testWithoutContext('buildModeOptions removes matching profile define in profile mode', () {
     expect(buildModeOptions(BuildMode.profile, <String>['dart.vm.profile=true']), <String>[
       '-Ddart.vm.product=false',
+      '--delete-tostring-package-uri=dart:ui',
+      '--delete-tostring-package-uri=package:flutter',
     ]);
   });
 
   testWithoutContext('buildModeOptions removes both matching profile and release define in profile mode', () {
     expect(buildModeOptions(BuildMode.profile, <String>['dart.vm.profile=false', 'dart.vm.product=true']), <String>[
+      '--delete-tostring-package-uri=dart:ui',
+      '--delete-tostring-package-uri=package:flutter',
     ]);
   });
 }