diff --git a/wxPython/src/_app_ex.py b/wxPython/src/_app_ex.py
index f70c78c26f..feb4b95715 100644
--- a/wxPython/src/_app_ex.py
+++ b/wxPython/src/_app_ex.py
@@ -60,6 +60,10 @@ class PyOnDemandOutputWindow:
             wx.CallAfter(self.frame.Close)
 
 
+    def flush(self):
+        pass
+    
+
 
 #----------------------------------------------------------------------