diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index 0edf27f4..b0f55635 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -433,7 +433,7 @@ namespace WebSocketSharp
     /// </value>
     public bool IsAlive {
       get {
-        return Ping ();
+        return ping (EmptyBytes);
       }
     }