diff --git a/ocaml/sdk-gen/csharp/autogen/src/Session.cs b/ocaml/sdk-gen/csharp/autogen/src/Session.cs
index e6b4b87eb47..82db84a8210 100644
--- a/ocaml/sdk-gen/csharp/autogen/src/Session.cs
+++ b/ocaml/sdk-gen/csharp/autogen/src/Session.cs
@@ -65,7 +65,6 @@ public Session(JsonRpcClient client)
             client.KeepAlive = true;
             client.UserAgent = UserAgent;
             client.WebProxy = Proxy;
-            client.JsonRpcVersion = JsonRpcVersion.v2;
             client.AllowAutoRedirect = true;
             JsonRpcClient = client;
         }
@@ -145,6 +144,14 @@ private void SetAPIVersion()
                 Host host = Host.get_record(this, pool.master);
                 APIVersion = Helper.GetAPIVersion(host.API_version_major, host.API_version_minor);
             }
+
+            if (JsonRpcClient != null)
+            {
+                if (APIVersion == API_Version.API_2_6)
+                    JsonRpcClient.JsonRpcVersion = JsonRpcVersion.v1;
+                else if (APIVersion >= API_Version.API_2_8)
+                    JsonRpcClient.JsonRpcVersion = JsonRpcVersion.v2;
+            }
         }
 
         private void CopyADFromSession(Session session)