diff --git a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Primitives/CSharpType.cs b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Primitives/CSharpType.cs
index 3538b8b926c..2c4de605e0d 100644
--- a/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Primitives/CSharpType.cs
+++ b/packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Primitives/CSharpType.cs
@@ -694,7 +694,7 @@ internal void Update(string? name = null, string? @namespace = null)
 
         internal static readonly IEqualityComparer<CSharpType> IgnoreNullableComparer = new CSharpTypeIgnoreNullableComparer();
 
-        private class CSharpTypeIgnoreNullableComparer : IEqualityComparer<CSharpType>
+        public sealed class CSharpTypeIgnoreNullableComparer : IEqualityComparer<CSharpType>
         {
             public bool Equals(CSharpType? x, CSharpType? y)
             {