diff --git a/src/mac/carbon/window.cpp b/src/mac/carbon/window.cpp
index e6ac15ee79..9e1334d4ce 100644
--- a/src/mac/carbon/window.cpp
+++ b/src/mac/carbon/window.cpp
@@ -3219,3 +3219,8 @@ wxByte wxWindowMac::GetTransparent() const
 {
     return m_macAlpha ;
 }
+
+bool wxWindowMac::IsShownOnScreen() const
+{
+    return ((wxWindowMac*)this)->MacIsReallyShown();
+}