diff --git a/engine/src/flutter/lib/web_ui/dev/test_platform.dart b/engine/src/flutter/lib/web_ui/dev/test_platform.dart
index 3296941a283..e9f5281710c 100644
--- a/engine/src/flutter/lib/web_ui/dev/test_platform.dart
+++ b/engine/src/flutter/lib/web_ui/dev/test_platform.dart
@@ -770,7 +770,7 @@ class BrowserManager {
         final String mapPath = p.join(
           env.environment.webUiRootDir.path,
           'build',
-          '$path.js.map',
+          '$path.browser_test.dart.js.map',
         );
         final JSStackTraceMapper mapper = JSStackTraceMapper(
           await File(mapPath).readAsString(),