diff --git a/test/IntegrationTests/MSTest.Acceptance.IntegrationTests/TelemetryTests.cs b/test/IntegrationTests/MSTest.Acceptance.IntegrationTests/TelemetryTests.cs
index b09a2e72cb..9d8fc98e34 100644
--- a/test/IntegrationTests/MSTest.Acceptance.IntegrationTests/TelemetryTests.cs
+++ b/test/IntegrationTests/MSTest.Acceptance.IntegrationTests/TelemetryTests.cs
@@ -8,6 +8,12 @@
 namespace MSTest.Acceptance.IntegrationTests;
 
 [TestClass]
+// The VSTest_* tests below invoke `dotnet test` against the same shared VSTest project
+// path for every target framework. Running them in parallel races on MSBuild outputs
+// such as `bin/Release/<tfm>/TelemetryVSTestProject.runtimeconfig.json` and shared
+// `obj/` files, which causes intermittent `GenerateRuntimeConfigurationFiles` failures.
+// Serialize all tests in this class to keep the suite deterministic.
+[DoNotParallelize]
 public sealed class TelemetryTests : AcceptanceTestBase<TelemetryTests.TestAssetFixture>
 {
     private const string MTPAssetName = "TelemetryMTPProject";