diff --git a/src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxTreeFactoryService.cs b/src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxTreeFactoryService.cs
index 258c91662d4deebe569ea4f2061d1a3c11a8baf1..374c6c6e00c6c1fc69570e4315e2934ac22287ba 100644
--- a/src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxTreeFactoryService.cs
+++ b/src/Workspaces/CSharp/Portable/LanguageServices/CSharpSyntaxTreeFactoryService.cs
@@ -16,7 +16,7 @@ namespace Microsoft.CodeAnalysis.CSharp
     [ExportLanguageServiceFactory(typeof(ISyntaxTreeFactoryService), LanguageNames.CSharp), Shared]
     internal partial class CSharpSyntaxTreeFactoryServiceFactory : ILanguageServiceFactory
     {
-        private static readonly CSharpParseOptions _parseOptionWithLatestLanguageVersion = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.Latest);
+        private static readonly CSharpParseOptions _parseOptionWithLatestLanguageVersion = CSharpParseOptions.Default.WithLanguageVersion(LanguageVersion.Preview);
 
         [ImportingConstructor]
         public CSharpSyntaxTreeFactoryServiceFactory()