diff --git a/src/BenchmarkDotNet.TestAdapter/BenchmarkCaseExtensions.cs b/src/BenchmarkDotNet.TestAdapter/BenchmarkCaseExtensions.cs
index 54557ae968..82e6d4b6ec 100644
--- a/src/BenchmarkDotNet.TestAdapter/BenchmarkCaseExtensions.cs
+++ b/src/BenchmarkDotNet.TestAdapter/BenchmarkCaseExtensions.cs
@@ -86,6 +86,7 @@ internal static Guid GetTestCaseId(this BenchmarkCase benchmarkCase)
         {
             var testIdProvider = new TestIdProvider();
             testIdProvider.AppendString(VsTestAdapter.ExecutorUriString);
+            testIdProvider.AppendString(benchmarkCase.Descriptor.Type.Namespace ?? string.Empty);
             testIdProvider.AppendString(benchmarkCase.Descriptor.DisplayInfo);
             testIdProvider.AppendString(benchmarkCase.GetUnrandomizedJobDisplayInfo());
             testIdProvider.AppendString(benchmarkCase.Parameters.DisplayInfo);