diff --git a/src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/IWorkspaceProjectContext.cs b/src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/IWorkspaceProjectContext.cs
index c4f85e677e0e9da3b44fc9fd54bbc005b4512b46..52fdb3316f919870e5faab0ee99192a47f5affab 100644
--- a/src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/IWorkspaceProjectContext.cs
+++ b/src/VisualStudio/Core/Def/Implementation/ProjectSystem/CPS/IWorkspaceProjectContext.cs
@@ -2,6 +2,8 @@
 
 using System;
 using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
 using Microsoft.CodeAnalysis;
 
 namespace Microsoft.VisualStudio.LanguageServices.ProjectSystem
@@ -36,6 +38,8 @@ internal interface IWorkspaceProjectContext : IDisposable
         void RemoveSourceFile(string filePath);
         void AddAdditionalFile(string filePath, bool isInCurrentContext = true);
         void RemoveAdditionalFile(string filePath);
+        void AddDynamicFile(string filePath, IEnumerable<string> folderNames = null);
+        void RemoveDynamicFile(string fullPath);
         void SetRuleSetFile(string filePath);
 
         void StartBatch();
diff --git a/src/VisualStudio/Core/Impl/ProjectSystem/CPS/CPSProject_IWorkspaceProjectContext.cs b/src/VisualStudio/Core/Impl/ProjectSystem/CPS/CPSProject_IWorkspaceProjectContext.cs
index 7a72c218fd4e7d2079614cd5b3df79c5de415747..9ea80f2d5c3592be491ced347a4848cca98b746b 100644
--- a/src/VisualStudio/Core/Impl/ProjectSystem/CPS/CPSProject_IWorkspaceProjectContext.cs
+++ b/src/VisualStudio/Core/Impl/ProjectSystem/CPS/CPSProject_IWorkspaceProjectContext.cs
@@ -101,7 +101,7 @@ public string BinOutputPath
 
                 // Compute the ref path based on the non-ref path. Ideally this should come from the
                 // project system but we don't have a way to fetch that.
-                _visualStudioProject.OutputRefFilePath = 
+                _visualStudioProject.OutputRefFilePath =
                     Path.Combine(Path.GetDirectoryName(_visualStudioProject.OutputFilePath),
                     "ref",
                     Path.GetFileName(_visualStudioProject.OutputFilePath));
@@ -184,6 +184,14 @@ public void RemoveAdditionalFile(string filePath)
             _visualStudioProject.RemoveAdditionalFile(filePath);
         }
 
+        public void AddDynamicFile(string filePath, IEnumerable<string> folderNames = null)
+        {
+        }
+
+        public void RemoveDynamicFile(string fullPath)
+        {
+        }
+
         public void SetRuleSetFile(string filePath)
         {
             // This is now a no-op: we also recieve the rule set file through SetOptions, and we'll just use that one
@@ -201,7 +209,7 @@ public void EndBatch()
             Contract.ThrowIfFalse(_batchScopes.TryDequeue(out var scope));
             scope.Dispose();
         }
-        
+
         internal VisualStudioProject GetProject_TestOnly()
         {
             return _visualStudioProject;