diff --git a/include/wx/mac/uma.h b/include/wx/mac/uma.h
index 344c1552e5..11e9cb7c5d 100644
--- a/include/wx/mac/uma.h
+++ b/include/wx/mac/uma.h
@@ -29,6 +29,7 @@ bool UMAHasAppearance() ;
 long UMAGetAppearanceVersion() ;
 bool UMAHasWindowManager() ;
 long UMAGetWindowManagerAttr() ;
+bool UMAHasAquaLayout() ;
 
 // process manager