diff --git a/wxPython/src/msw/windows3.cpp b/wxPython/src/msw/windows3.cpp
index 901a82cec7..effbc4e5c6 100644
--- a/wxPython/src/msw/windows3.cpp
+++ b/wxPython/src/msw/windows3.cpp
@@ -103,11 +103,12 @@ public:
         : wxPopupTransientWindow(parent, style) {}
 
     DEC_PYCALLBACK_BOOL_ME(ProcessLeftDown);
+    DEC_PYCALLBACK__(OnDismiss);
     PYPRIVATE;
 };
 
 IMP_PYCALLBACK_BOOL_ME(wxPyPopupTransientWindow, wxPopupTransientWindow, ProcessLeftDown);
-
+IMP_PYCALLBACK__(wxPyPopupTransientWindow, wxPopupTransientWindow, OnDismiss);
 #ifdef __cplusplus
 extern "C" {
 #endif