diff --git a/clients/ts/signalr/src/HandshakeProtocol.ts b/clients/ts/signalr/src/HandshakeProtocol.ts
index ba6906ef5f..eebc8fc57e 100644
--- a/clients/ts/signalr/src/HandshakeProtocol.ts
+++ b/clients/ts/signalr/src/HandshakeProtocol.ts
@@ -10,6 +10,7 @@ export interface HandshakeRequestMessage {
 
 export interface HandshakeResponseMessage {
     readonly error: string;
+    readonly minorVersion: number;
 }
 
 export class HandshakeProtocol {