diff --git a/rosserial_python/src/rosserial_python/SerialClient.py b/rosserial_python/src/rosserial_python/SerialClient.py
index 6b1b87574..0139a39b4 100644
--- a/rosserial_python/src/rosserial_python/SerialClient.py
+++ b/rosserial_python/src/rosserial_python/SerialClient.py
@@ -282,6 +282,9 @@ def startSocketServer(self, port, address):
 
     def flushInput(self):
         pass
+    
+    def flushOutput(self):
+        pass
 
     def write(self, data):
         if not self.isConnected: