diff --git a/include/wx/popupwin.h b/include/wx/popupwin.h
index e33370b924..f2ca8c251c 100644
--- a/include/wx/popupwin.h
+++ b/include/wx/popupwin.h
@@ -127,7 +127,7 @@ protected:
     // get alerted when child gets deleted from under us
     void OnDestroy(wxWindowDestroyEvent& event);
 
-#ifdef __WXMSW__
+#if defined( __WXMSW__ ) || defined( __WXMAC__ )
     // check if the mouse needs captured or released
     void OnIdle(wxIdleEvent& event);
 #endif