diff --git a/include/wx/mac/carbon/chkconf.h b/include/wx/mac/carbon/chkconf.h
index a60e022900..ac2332341e 100644
--- a/include/wx/mac/carbon/chkconf.h
+++ b/include/wx/mac/carbon/chkconf.h
@@ -90,8 +90,8 @@
 
 #if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_5
 
-#define wxMAC_USE_CORE_TEXT 0
-#define wxMAC_USE_ATSU_TEXT 1
+#define wxMAC_USE_CORE_TEXT 1
+#define wxMAC_USE_ATSU_TEXT 0
 
 #else // platform < 10.5