diff --git a/src/mac/carbon/menu.cpp b/src/mac/carbon/menu.cpp
index a5bf7019b1..931f25c3fd 100644
--- a/src/mac/carbon/menu.cpp
+++ b/src/mac/carbon/menu.cpp
@@ -819,7 +819,7 @@ wxMenu *wxMenuBar::Replace(size_t pos, wxMenu *menu, const wxString& title)
 {
     wxMenu *menuOld = wxMenuBarBase::Replace(pos, menu, title);
     if ( !menuOld )
-        return false;
+        return NULL;
 
     m_titles[pos] = title;