diff --git a/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs b/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
index 4025a301cee7fb..aeb11216ab04c6 100644
--- a/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
+++ b/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
@@ -309,7 +309,7 @@ public Socket(System.Net.Sockets.SocketType socketType, System.Net.Sockets.Proto
         public System.IAsyncResult? BeginSend(byte[] buffer, int offset, int size, System.Net.Sockets.SocketFlags socketFlags, out System.Net.Sockets.SocketError errorCode, System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult BeginSend(System.Collections.Generic.IList<System.ArraySegment<byte>> buffers, System.Net.Sockets.SocketFlags socketFlags, System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult? BeginSend(System.Collections.Generic.IList<System.ArraySegment<byte>> buffers, System.Net.Sockets.SocketFlags socketFlags, out System.Net.Sockets.SocketError errorCode, System.AsyncCallback? callback, object? state) { throw null; }
-        public System.IAsyncResult BeginSendFile(string fileName, System.AsyncCallback? callback, object? state) { throw null; }
+        public System.IAsyncResult BeginSendFile(string? fileName, System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult BeginSendFile(string? fileName, byte[]? preBuffer, byte[]? postBuffer, System.Net.Sockets.TransmitFileOptions flags, System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult BeginSendTo(byte[] buffer, int offset, int size, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEP, System.AsyncCallback? callback, object? state) { throw null; }
         public void Bind(System.Net.EndPoint localEP) { }
diff --git a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.cs b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.cs
index 82465b65581629..52558da8110d20 100644
--- a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.cs
+++ b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/Socket.cs
@@ -2664,7 +2664,7 @@ public int EndSend(IAsyncResult asyncResult, out SocketError errorCode)
             return bytesTransferred;
         }
 
-        public IAsyncResult BeginSendFile(string fileName, AsyncCallback? callback, object? state)
+        public IAsyncResult BeginSendFile(string? fileName, AsyncCallback? callback, object? state)
         {
             return BeginSendFile(fileName, null, null, TransmitFileOptions.UseDefaultWorkerThread, callback, state);
         }