diff --git a/demo/Main.py b/demo/Main.py
index a0ab7e9c..e816e052 100644
--- a/demo/Main.py
+++ b/demo/Main.py
@@ -1554,11 +1554,11 @@ class MainPanel(wx.Panel):
     around an issue on wxGTK.
     """
     def Freeze(self):
-        if not 'wxGTK' in wx.PlatformInfo:
+        if 'wxMSW' in wx.PlatformInfo:
             return super(MainPanel, self).Freeze()
 
     def Thaw(self):
-        if not 'wxGTK' in wx.PlatformInfo:
+        if 'wxMSW' in wx.PlatformInfo:
             return super(MainPanel, self).Thaw()
 
 #---------------------------------------------------------------------------