diff --git a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingMutatingRequestHandler.cs b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingMutatingRequestHandler.cs
index d889763c8a372afd9779748ce709953f2aaf4b9f..deadc6b99454fe18a234ba5b6eb5aa3e3dcb1fb7 100644
--- a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingMutatingRequestHandler.cs
+++ b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingMutatingRequestHandler.cs
@@ -11,7 +11,7 @@
 
 namespace Microsoft.CodeAnalysis.LanguageServer.UnitTests.RequestOrdering
 {
-    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: true)]
+    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: true), PartNotDiscoverable]
     internal class FailingMutatingRequestHandler : AbstractRequestHandler<TestRequest, TestResponse>
     {
         public const string MethodName = nameof(FailingMutatingRequestHandler);
diff --git a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingRequestHandler.cs b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingRequestHandler.cs
index e95dfb396ae84e9e7759833a8dce2b3e5d6fc38f..7502fabf472fba3e4f51ced29f0480582e46a7b9 100644
--- a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingRequestHandler.cs
+++ b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/FailingRequestHandler.cs
@@ -11,7 +11,7 @@
 
 namespace Microsoft.CodeAnalysis.LanguageServer.UnitTests.RequestOrdering
 {
-    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: false)]
+    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: false), PartNotDiscoverable]
     internal class FailingRequestHandler : AbstractRequestHandler<TestRequest, TestResponse>
     {
         public const string MethodName = nameof(FailingRequestHandler);
diff --git a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/MutatingRequestHandler.cs b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/MutatingRequestHandler.cs
index 80604697f2d54ae904a5d4487ceb71b5a9003379..80dbb19fae56c4fd474862d2e825b832016e6349 100644
--- a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/MutatingRequestHandler.cs
+++ b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/MutatingRequestHandler.cs
@@ -11,7 +11,7 @@
 
 namespace Microsoft.CodeAnalysis.LanguageServer.UnitTests.RequestOrdering
 {
-    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: true)]
+    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: true), PartNotDiscoverable]
     internal class MutatingRequestHandler : AbstractRequestHandler<TestRequest, TestResponse>
     {
         public const string MethodName = nameof(MutatingRequestHandler);
diff --git a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/NonMutatingRequestHandler.cs b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/NonMutatingRequestHandler.cs
index 18f8ed4fc16ac8327b7a419337a01179c1798159..a2b76c4b6f07e877cfdd871cd05df423155a505f 100644
--- a/src/Features/LanguageServer/ProtocolUnitTests/Ordering/NonMutatingRequestHandler.cs
+++ b/src/Features/LanguageServer/ProtocolUnitTests/Ordering/NonMutatingRequestHandler.cs
@@ -11,7 +11,7 @@
 
 namespace Microsoft.CodeAnalysis.LanguageServer.UnitTests.RequestOrdering
 {
-    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: false)]
+    [Shared, ExportLspMethod(MethodName, mutatesSolutionState: false), PartNotDiscoverable]
     internal class NonMutatingRequestHandler : AbstractRequestHandler<TestRequest, TestResponse>
     {
         public const string MethodName = nameof(NonMutatingRequestHandler);