diff --git a/libraries/botframework-streaming/src/interfaces/INodeSocket.ts b/libraries/botframework-streaming/src/interfaces/INodeSocket.ts
index 3e5faeb12e..a92853c8f0 100644
--- a/libraries/botframework-streaming/src/interfaces/INodeSocket.ts
+++ b/libraries/botframework-streaming/src/interfaces/INodeSocket.ts
@@ -28,6 +28,7 @@ export interface INodeSocket {
     readonly writableLength: number;
     readonly readableHighWaterMark: number;
     readonly readableLength: number;
+    readonly readableFlowing: boolean | null;
 
     address(): AddressInfo | string;