diff --git a/runtime/observatory/tests/service/verify_http_timeline_test.dart b/runtime/observatory/tests/service/verify_http_timeline_test.dart
index dfd6ad88df4..f7809c87a13 100644
--- a/runtime/observatory/tests/service/verify_http_timeline_test.dart
+++ b/runtime/observatory/tests/service/verify_http_timeline_test.dart
@@ -201,6 +201,7 @@ void validateHttpStartEvent(Map event, String method) {
   final args = event['args'];
   expect(args.containsKey('method'), isTrue);
   expect(args['method'], method);
+  expect(args['filterKey'], 'HTTP/client');
   if (!args.containsKey('error')) {
     expect(args.containsKey('requestHeaders'), isTrue);
     expect(args['requestHeaders'] != null, isTrue);
@@ -226,6 +227,7 @@ void validateHttpStartEvent(Map event, String method) {
 void validateHttpFinishEvent(Map event) {
   expect(event.containsKey('args'), isTrue);
   final args = event['args'];
+  expect(args['filterKey'], 'HTTP/client');
   expect(args.containsKey('compressionState'), isTrue);
   expect(args.containsKey('connectionInfo'), isTrue);
   expect(args.containsKey('contentLength'), isTrue);
diff --git a/sdk/lib/_http/http_impl.dart b/sdk/lib/_http/http_impl.dart
index 336c6d0d844..890a570fa12 100644
--- a/sdk/lib/_http/http_impl.dart
+++ b/sdk/lib/_http/http_impl.dart
@@ -2257,8 +2257,6 @@ class _HttpClient implements HttpClient {
   static void _startRequestTimelineEvent(
       TimelineTask timeline, String method, Uri uri) {
     timeline?.start('HTTP CLIENT ${method.toUpperCase()}', arguments: {
-      'filterKey':
-          'HTTP/client', // key used to filter network requests from timeline
       'method': method.toUpperCase(),
       'uri': uri.toString(),
     });
@@ -2304,7 +2302,7 @@ class _HttpClient implements HttpClient {
     TimelineTask timeline;
     // TODO(bkonyi): do we want this to be opt-in?
     if (HttpClient.enableTimelineLogging) {
-      timeline = TimelineTask();
+      timeline = TimelineTask(filterKey: 'HTTP/client');
       _startRequestTimelineEvent(timeline, method, uri);
     }
     return _getConnection(uri.host, port, proxyConf, isSecure, timeline).then(
diff --git a/sdk_nnbd/lib/_http/http_impl.dart b/sdk_nnbd/lib/_http/http_impl.dart
index a63bf64f30b..5b9782a8ebb 100644
--- a/sdk_nnbd/lib/_http/http_impl.dart
+++ b/sdk_nnbd/lib/_http/http_impl.dart
@@ -2257,8 +2257,6 @@ class _HttpClient implements HttpClient {
   static void _startRequestTimelineEvent(
       TimelineTask? timeline, String method, Uri uri) {
     timeline?.start('HTTP CLIENT ${method.toUpperCase()}', arguments: {
-      'filterKey':
-          'HTTP/client', // key used to filter network requests from timeline
       'method': method.toUpperCase(),
       'uri': uri.toString(),
     });
@@ -2305,7 +2303,7 @@ class _HttpClient implements HttpClient {
     TimelineTask? timeline;
     // TODO(bkonyi): do we want this to be opt-in?
     if (HttpClient.enableTimelineLogging) {
-      timeline = TimelineTask();
+      timeline = TimelineTask(filterKey: 'HTTP/client');
       _startRequestTimelineEvent(timeline, method, uri);
     }
     return _getConnection(uri.host, port, proxyConf, isSecure, timeline).then(