diff --git a/csharp-es/Library/Result.cs b/csharp-es/Library/Result.cs
index 123578a..5e2e93f 100644
--- a/csharp-es/Library/Result.cs
+++ b/csharp-es/Library/Result.cs
@@ -21,8 +21,11 @@ public static class ResultModule
 {
     public static T Ok<T>(T v) => v;
 
+    public static Result<T?, E> Ok<T, E>(T v)
+        => new ResultOk<T?, E>(v);
+
     public static Result<T?, E> OkNone<T, E>()
-        where T : class? => new ResultOk<T?, E>(null);
+         => new ResultOk<T?, E>(default);
 
     public static E Fail<E>(E e) => e;
 }
diff --git a/csharp-fp3/Library/Result.cs b/csharp-fp3/Library/Result.cs
index d690b5f..ce941bc 100644
--- a/csharp-fp3/Library/Result.cs
+++ b/csharp-fp3/Library/Result.cs
@@ -21,8 +21,11 @@ public static class ResultModule
 {
     public static T Ok<T>(T v) => v;
 
+    public static Result<T?, E> Ok<T, E>(T v)
+        => new ResultOk<T?, E>(v);
+
     public static Result<T?, E> OkNone<T, E>()
-        where T : class? => new ResultOk<T?, E>(null);
+        => new ResultOk<T?, E>(default);
 
     public static E Fail<E>(E e) => e;
 }