diff --git a/src/xunit.runner.visualstudio/Constants.cs b/src/xunit.runner.visualstudio/Constants.cs
index 97aef60..0543da4 100644
--- a/src/xunit.runner.visualstudio/Constants.cs
+++ b/src/xunit.runner.visualstudio/Constants.cs
@@ -1,6 +1,6 @@
 namespace Xunit.Runner.VisualStudio;
 
-public static class Constants
+internal static class Constants
 {
 #if NETFRAMEWORK
 	public const string ExecutorUri = "executor://xunit/VsTestRunner3/netfx/";
diff --git a/src/xunit.runner.visualstudio/Sinks/DiagnosticMessageSink.cs b/src/xunit.runner.visualstudio/Sinks/DiagnosticMessageSink.cs
index 49f46e4..081b4c0 100644
--- a/src/xunit.runner.visualstudio/Sinks/DiagnosticMessageSink.cs
+++ b/src/xunit.runner.visualstudio/Sinks/DiagnosticMessageSink.cs
@@ -2,7 +2,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public class DiagnosticMessageSink : DiagnosticEventSink
+internal class DiagnosticMessageSink : DiagnosticEventSink
 {
 	public DiagnosticMessageSink(
 		LoggerHelper log,
diff --git a/src/xunit.runner.visualstudio/Sinks/VsDiscoverySink.cs b/src/xunit.runner.visualstudio/Sinks/VsDiscoverySink.cs
index 51d8f56..c577582 100644
--- a/src/xunit.runner.visualstudio/Sinks/VsDiscoverySink.cs
+++ b/src/xunit.runner.visualstudio/Sinks/VsDiscoverySink.cs
@@ -15,7 +15,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public sealed class VsDiscoverySink : IVsDiscoverySink, IDisposable
+internal sealed class VsDiscoverySink : IVsDiscoverySink, IDisposable
 {
 	static readonly string Ellipsis = new((char)183, 3);
 	const int MaximumDisplayNameLength = 447;
diff --git a/src/xunit.runner.visualstudio/Sinks/VsExecutionSink.cs b/src/xunit.runner.visualstudio/Sinks/VsExecutionSink.cs
index 942569f..124f6b4 100644
--- a/src/xunit.runner.visualstudio/Sinks/VsExecutionSink.cs
+++ b/src/xunit.runner.visualstudio/Sinks/VsExecutionSink.cs
@@ -14,7 +14,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public sealed class VsExecutionSink : TestMessageSink, IDisposable
+internal sealed class VsExecutionSink : TestMessageSink, IDisposable
 {
 	readonly Func<bool> cancelledThunk;
 	readonly LoggerHelper logger;
diff --git a/src/xunit.runner.visualstudio/TestPlatformContext.cs b/src/xunit.runner.visualstudio/TestPlatformContext.cs
index 2748ef9..b2c2fa5 100644
--- a/src/xunit.runner.visualstudio/TestPlatformContext.cs
+++ b/src/xunit.runner.visualstudio/TestPlatformContext.cs
@@ -4,7 +4,7 @@ namespace Xunit.Runner.VisualStudio;
 /// Provides contextual information on a test run/discovery based on runsettings
 /// or the invocation (execution, discovery).
 /// </summary>
-public struct TestPlatformContext
+internal struct TestPlatformContext
 {
 	/// <summary>
 	/// Indicates if the test runner is running in design mode (meaning, inside the Visual Studio IDE).
diff --git a/src/xunit.runner.visualstudio/Utility/AssemblyRunInfo.cs b/src/xunit.runner.visualstudio/Utility/AssemblyRunInfo.cs
index af02f0f..50002a5 100644
--- a/src/xunit.runner.visualstudio/Utility/AssemblyRunInfo.cs
+++ b/src/xunit.runner.visualstudio/Utility/AssemblyRunInfo.cs
@@ -5,7 +5,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public class AssemblyRunInfo
+internal class AssemblyRunInfo
 {
 	AssemblyRunInfo(
 		LoggerHelper logger,
diff --git a/src/xunit.runner.visualstudio/Utility/LoggerHelper.cs b/src/xunit.runner.visualstudio/Utility/LoggerHelper.cs
index d2acdff..d11f54c 100644
--- a/src/xunit.runner.visualstudio/Utility/LoggerHelper.cs
+++ b/src/xunit.runner.visualstudio/Utility/LoggerHelper.cs
@@ -6,7 +6,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public class LoggerHelper(IMessageLogger? logger, Stopwatch stopwatch)
+internal class LoggerHelper(IMessageLogger? logger, Stopwatch stopwatch)
 {
 	public IMessageLogger? InnerLogger { get; private set; } = logger;
 
diff --git a/src/xunit.runner.visualstudio/Utility/RunSettings.cs b/src/xunit.runner.visualstudio/Utility/RunSettings.cs
index 9ff7c24..3edbd91 100644
--- a/src/xunit.runner.visualstudio/Utility/RunSettings.cs
+++ b/src/xunit.runner.visualstudio/Utility/RunSettings.cs
@@ -6,7 +6,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public class RunSettings
+internal class RunSettings
 {
 	public AppDomainSupport? AppDomain { get; set; }
 	public string? Culture { get; set; }
diff --git a/src/xunit.runner.visualstudio/Utility/TestCaseFilter.cs b/src/xunit.runner.visualstudio/Utility/TestCaseFilter.cs
index 836cb3d..edcff37 100644
--- a/src/xunit.runner.visualstudio/Utility/TestCaseFilter.cs
+++ b/src/xunit.runner.visualstudio/Utility/TestCaseFilter.cs
@@ -7,7 +7,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public class TestCaseFilter
+internal class TestCaseFilter
 {
 	const string DisplayNameString = "DisplayName";
 	const string FullyQualifiedNameString = "FullyQualifiedName";
diff --git a/src/xunit.runner.visualstudio/Utility/VisualStudioRunnerLogger.cs b/src/xunit.runner.visualstudio/Utility/VisualStudioRunnerLogger.cs
index a041494..277d2a3 100644
--- a/src/xunit.runner.visualstudio/Utility/VisualStudioRunnerLogger.cs
+++ b/src/xunit.runner.visualstudio/Utility/VisualStudioRunnerLogger.cs
@@ -2,7 +2,7 @@
 
 namespace Xunit.Runner.VisualStudio;
 
-public class VisualStudioRunnerLogger(LoggerHelper loggerHelper) :
+internal class VisualStudioRunnerLogger(LoggerHelper loggerHelper) :
 	IRunnerLogger
 {
 	static readonly object lockObject = new();
diff --git a/src/xunit.runner.visualstudio/VsTestRunner.cs b/src/xunit.runner.visualstudio/VsTestRunner.cs
index 0e90c05..4d85b3a 100644
--- a/src/xunit.runner.visualstudio/VsTestRunner.cs
+++ b/src/xunit.runner.visualstudio/VsTestRunner.cs
@@ -120,22 +120,22 @@ public class VsTestRunner : ITestDiscoverer, ITestExecutor
 			"xunit.v3.runner.utility.netstandard20.dll",
 		};
 
-		public static TestProperty ManagedMethodProperty { get; } =
+		internal static TestProperty ManagedMethodProperty { get; } =
 			TestProperty.Register("TestCase.ManagedMethod", "ManagedMethod", string.Empty, string.Empty, typeof(string), x => !string.IsNullOrWhiteSpace(x as string), TestPropertyAttributes.Hidden, typeof(TestCase));
 
-		public static TestProperty ManagedTypeProperty { get; } =
+		internal static TestProperty ManagedTypeProperty { get; } =
 			TestProperty.Register("TestCase.ManagedType", "ManagedType", string.Empty, string.Empty, typeof(string), x => !string.IsNullOrWhiteSpace(x as string), TestPropertyAttributes.Hidden, typeof(TestCase));
 
-		public static TestProperty SkipReasonProperty { get; } =
+		internal static TestProperty SkipReasonProperty { get; } =
 			TestProperty.Register("XunitSkipReason", "xUnit.net Skip Reason", typeof(string), typeof(VsTestRunner));
 
-		public static TestProperty TestCaseExplicitProperty { get; } =
+		internal static TestProperty TestCaseExplicitProperty { get; } =
 			TestProperty.Register("XunitTestCaseExplicit", "xUnit.net Test Case Explicit Flag", typeof(bool), typeof(VsTestRunner));
 
-		public static TestProperty TestCaseSerializationProperty { get; } =
+		internal static TestProperty TestCaseSerializationProperty { get; } =
 			TestProperty.Register("XunitTestCaseSerialization", "xUnit.net Test Case Serialization", typeof(string), typeof(VsTestRunner));
 
-		public static TestProperty TestCaseUniqueIDProperty { get; } =
+		internal static TestProperty TestCaseUniqueIDProperty { get; } =
 			TestProperty.Register("XunitTestCaseUniqueID", "xUnit.net Test Case Unique ID", typeof(string), typeof(VsTestRunner));
 
 		public void Cancel() =>
@@ -307,7 +307,7 @@ async Task<bool> DiscoverTestsInAssembly<TVisitor>(
 			return true;
 		}
 
-		public static IReadOnlyList<IRunnerReporter> GetAvailableRunnerReporters(LoggerHelper? logger)
+		internal static IReadOnlyList<IRunnerReporter> GetAvailableRunnerReporters(LoggerHelper? logger)
 		{
 			var result = RegisteredRunnerReporters.Get(typeof(VsTestRunner).Assembly, out var messages);
 
@@ -318,7 +318,7 @@ public static IReadOnlyList<IRunnerReporter> GetAvailableRunnerReporters(LoggerH
 			return result;
 		}
 
-		public static IRunnerReporter GetRunnerReporter(
+		internal static IRunnerReporter GetRunnerReporter(
 			LoggerHelper? logger,
 			RunSettings runSettings)
 		{
diff --git a/src/xunit.runner.visualstudio/xunit.runner.visualstudio.csproj b/src/xunit.runner.visualstudio/xunit.runner.visualstudio.csproj
index 99651f3..70df5b0 100644
--- a/src/xunit.runner.visualstudio/xunit.runner.visualstudio.csproj
+++ b/src/xunit.runner.visualstudio/xunit.runner.visualstudio.csproj
@@ -12,6 +12,10 @@
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
+  <ItemGroup>
+    <InternalsVisibleTo Include="test.xunit.runner.visualstudio" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="xunit.analyzers" Version="$(XunitAnalyzersVersion)" PrivateAssets="All" />
     <PackageReference Include="xunit.v3.runner.utility" Version="$(XunitV3Version)" />
diff --git a/test/test.xunit.runner.visualstudio/RunSettingsTests.cs b/test/test.xunit.runner.visualstudio/RunSettingsTests.cs
index 30876bf..a42e78c 100644
--- a/test/test.xunit.runner.visualstudio/RunSettingsTests.cs
+++ b/test/test.xunit.runner.visualstudio/RunSettingsTests.cs
@@ -1,8 +1,10 @@
+extern alias VSTestAdapter;
+
 using System;
 using Xunit;
 using Xunit.Runner.Common;
-using Xunit.Runner.VisualStudio;
 using Xunit.Sdk;
+using RunSettings = VSTestAdapter.Xunit.Runner.VisualStudio.RunSettings;
 
 public class RunSettingsTests
 {
diff --git a/test/test.xunit.runner.visualstudio/RunnerReporterTests.cs b/test/test.xunit.runner.visualstudio/RunnerReporterTests.cs
index 04bfddb..04d3856 100644
--- a/test/test.xunit.runner.visualstudio/RunnerReporterTests.cs
+++ b/test/test.xunit.runner.visualstudio/RunnerReporterTests.cs
@@ -1,10 +1,14 @@
+extern alias VSTestAdapter;
+
 using System;
 using System.Diagnostics;
 using Microsoft.VisualStudio.TestPlatform.ObjectModel.Logging;
 using NSubstitute;
 using Xunit;
 using Xunit.Runner.Common;
-using Xunit.Runner.VisualStudio;
+using LoggerHelper = VSTestAdapter.Xunit.Runner.VisualStudio.LoggerHelper;
+using RunSettings = VSTestAdapter.Xunit.Runner.VisualStudio.RunSettings;
+using VsTestRunner = VSTestAdapter.Xunit.Runner.VisualStudio.VsTestRunner;
 
 public class RunnerReporterTests
 {
diff --git a/test/test.xunit.runner.visualstudio/Sinks/VsDiscoverySinkTests.cs b/test/test.xunit.runner.visualstudio/Sinks/VsDiscoverySinkTests.cs
index f32769d..d8a641b 100644
--- a/test/test.xunit.runner.visualstudio/Sinks/VsDiscoverySinkTests.cs
+++ b/test/test.xunit.runner.visualstudio/Sinks/VsDiscoverySinkTests.cs
@@ -1,8 +1,14 @@
+extern alias VSTestAdapter;
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using Xunit;
 using Xunit.Runner.VisualStudio;
+using Constants = VSTestAdapter.Xunit.Runner.VisualStudio.Constants;
+using TestPlatformContext = VSTestAdapter.Xunit.Runner.VisualStudio.TestPlatformContext;
+using VsDiscoverySink = VSTestAdapter.Xunit.Runner.VisualStudio.VsDiscoverySink;
+using VsTestRunner = VSTestAdapter.Xunit.Runner.VisualStudio.VsTestRunner;
 
 public class VsDiscoverySinkTests
 {
@@ -45,7 +51,7 @@ public void StandardData(
 
 			Assert.NotNull(vsTestCase);
 
-			// Standard VSTest properties
+			// Standard VSTest propertiesgi
 			Assert.Equal("/source/file.cs", vsTestCase.CodeFilePath);
 			Assert.Equal("test-case-display-name", vsTestCase.DisplayName);
 			Assert.Equal(Constants.ExecutorUri, vsTestCase.ExecutorUri.OriginalString);
diff --git a/test/test.xunit.runner.visualstudio/TestCaseFilterTests.cs b/test/test.xunit.runner.visualstudio/TestCaseFilterTests.cs
index b7caa5f..789f35c 100644
--- a/test/test.xunit.runner.visualstudio/TestCaseFilterTests.cs
+++ b/test/test.xunit.runner.visualstudio/TestCaseFilterTests.cs
@@ -1,3 +1,5 @@
+extern alias VSTestAdapter;
+
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
@@ -7,8 +9,9 @@
 using Microsoft.VisualStudio.TestPlatform.ObjectModel.Logging;
 using NSubstitute;
 using Xunit;
-using Xunit.Runner.VisualStudio;
-using Constants = Xunit.Runner.VisualStudio.Constants;
+using Constants = VSTestAdapter.Xunit.Runner.VisualStudio.Constants;
+using LoggerHelper = VSTestAdapter.Xunit.Runner.VisualStudio.LoggerHelper;
+using TestCaseFilter = VSTestAdapter.Xunit.Runner.VisualStudio.TestCaseFilter;
 
 public class TestCaseFilterTests
 {
diff --git a/test/test.xunit.runner.visualstudio/Utility/SpyLoggerHelper.cs b/test/test.xunit.runner.visualstudio/Utility/SpyLoggerHelper.cs
index fe934cb..0783671 100644
--- a/test/test.xunit.runner.visualstudio/Utility/SpyLoggerHelper.cs
+++ b/test/test.xunit.runner.visualstudio/Utility/SpyLoggerHelper.cs
@@ -1,10 +1,13 @@
+extern alias VSTestAdapter;
+
 using System.Collections.Generic;
 using System.Diagnostics;
 using Microsoft.VisualStudio.TestPlatform.ObjectModel.Logging;
+using LoggerHelper = VSTestAdapter.Xunit.Runner.VisualStudio.LoggerHelper;
 
 namespace Xunit.Runner.VisualStudio;
 
-public class SpyLoggerHelper(SpyMessageLogger logger, Stopwatch stopwatch) :
+internal class SpyLoggerHelper(SpyMessageLogger logger, Stopwatch stopwatch) :
 	LoggerHelper(logger, stopwatch)
 {
 	public IReadOnlyCollection<string> Messages => logger.Messages;
diff --git a/test/test.xunit.runner.visualstudio/VsTestRunnerTests.cs b/test/test.xunit.runner.visualstudio/VsTestRunnerTests.cs
index b144a06..e6a956e 100644
--- a/test/test.xunit.runner.visualstudio/VsTestRunnerTests.cs
+++ b/test/test.xunit.runner.visualstudio/VsTestRunnerTests.cs
@@ -1,7 +1,9 @@
+extern alias VSTestAdapter;
+
 using System.ComponentModel;
 using System.Reflection;
 using Xunit;
-using Xunit.Runner.VisualStudio;
+using VsTestRunner = VSTestAdapter.Xunit.Runner.VisualStudio.VsTestRunner;
 
 public class VsTestRunnerTests
 {
diff --git a/test/test.xunit.runner.visualstudio/test.xunit.runner.visualstudio.csproj b/test/test.xunit.runner.visualstudio/test.xunit.runner.visualstudio.csproj
index 15b1164..9a6907c 100644
--- a/test/test.xunit.runner.visualstudio/test.xunit.runner.visualstudio.csproj
+++ b/test/test.xunit.runner.visualstudio/test.xunit.runner.visualstudio.csproj
@@ -15,7 +15,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\..\src\xunit.runner.visualstudio\xunit.runner.visualstudio.csproj" />
+    <ProjectReference Include="..\..\src\xunit.runner.visualstudio\xunit.runner.visualstudio.csproj">
+      <Aliases>VSTestAdapter</Aliases>
+    </ProjectReference>
   </ItemGroup>
 
 </Project>