diff --git a/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/Diagnostics/RazorSourceGeneratorResources.resx b/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/Diagnostics/RazorSourceGeneratorResources.resx
index f589cf9f855..9ce6a9a2f0b 100644
--- a/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/Diagnostics/RazorSourceGeneratorResources.resx
+++ b/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/Diagnostics/RazorSourceGeneratorResources.resx
@@ -121,7 +121,7 @@
     <value>Invalid RazorLangVersion</value>
   </data>
   <data name="InvalidRazorLangMessage" xml:space="preserve">
-    <value>Invalid value '{0}'' for RazorLangVersion. Valid values include 'Latest' or a valid version in range 1.0 to 8.0.</value>
+    <value>Invalid value '{0}' for RazorLangVersion. Valid values include 'Latest', 'Preview', or a valid version in range 1.0 to {1}.</value>
   </data>
   <data name="RecomputingTagHelpersTitle" xml:space="preserve">
     <value>Recomputing tag helpers</value>
diff --git a/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/RazorSourceGenerator.RazorProviders.cs b/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/RazorSourceGenerator.RazorProviders.cs
index eb089d0a7f4..20320759d8d 100644
--- a/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/RazorSourceGenerator.RazorProviders.cs
+++ b/src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/SourceGenerators/RazorSourceGenerator.RazorProviders.cs
@@ -41,7 +41,8 @@ public partial class RazorSourceGenerator
                 diagnostic = Diagnostic.Create(
                     RazorDiagnostics.InvalidRazorLangVersionDescriptor,
                     Location.None,
-                    razorLanguageVersionString);
+                    razorLanguageVersionString,
+                    RazorLanguageVersion.Preview.ToString());
                 razorLanguageVersion = RazorLanguageVersion.Latest;
             }
 
diff --git a/src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/RazorSourceGeneratorTests.cs b/src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/RazorSourceGeneratorTests.cs
index c1fcd399a07..115da85f650 100644
--- a/src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/RazorSourceGeneratorTests.cs
+++ b/src/Compiler/test/Microsoft.NET.Sdk.Razor.SourceGenerators.Tests/RazorSourceGeneratorTests.cs
@@ -10,7 +10,7 @@
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-using Microsoft.AspNetCore.Razor.Language.Syntax;
+using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.Test.Utilities;
@@ -3101,8 +3101,8 @@ public async Task RazorLangVersion_Incorrect([CombinatorialValues("incorrect", "
             var result = RunGenerator(compilation!, ref driver);
 
             result.Diagnostics.Verify(
-                // error RZ3600: Invalid value '{0}'' for RazorLangVersion. Valid values include 'Latest' or a valid version in range 1.0 to 8.0.
-                Diagnostic("RZ3600").WithArguments(langVersion).WithLocation(1, 1));
+                // error RZ3600: Invalid value '{0}' for RazorLangVersion. Valid values include 'Latest', 'Preview', or a valid version in range 1.0 to {1}.
+                Diagnostic("RZ3600").WithArguments(langVersion, RazorLanguageVersion.Preview.ToString()).WithLocation(1, 1));
             Assert.Single(result.GeneratedSources);
         }
 
@@ -3272,7 +3272,7 @@ public async Task IncrementalCompilation_OnlyCompilationRuns_When_MetadataRefere
             Assert.Equal(2, result.GeneratedSources.Length);
             Assert.Empty(eventListener.Events);
 
-            var reference = (PortableExecutableReference) project.MetadataReferences[^1];
+            var reference = (PortableExecutableReference)project.MetadataReferences[^1];
 
             project = project.RemoveMetadataReference(reference)
                              .AddMetadataReference(MetadataReference.CreateFromFile(reference.FilePath!));