diff --git a/src/mac/carbon/nonownedwnd.cpp b/src/mac/carbon/nonownedwnd.cpp
index c43ba0476f..c6d9c28841 100644
--- a/src/mac/carbon/nonownedwnd.cpp
+++ b/src/mac/carbon/nonownedwnd.cpp
@@ -21,6 +21,8 @@
 #include "wx/nonownedwnd.h"
 
 #include "wx/mac/private.h"
+#include "wx/settings.h"
+#include "wx/frame.h"
 
 #if wxUSE_SYSTEM_OPTIONS
     #include "wx/sysopt.h"