diff --git a/include/wx/mac/carbon/gsockmac.h b/include/wx/mac/carbon/gsockmac.h
index 49bd37d033..0b73be833e 100644
--- a/include/wx/mac/carbon/gsockmac.h
+++ b/include/wx/mac/carbon/gsockmac.h
@@ -21,12 +21,16 @@
 #include "gsocket.h"
 #endif
 
+#ifndef OTUNIXERRORS
+
 #include <MacHeaders.c>
 #define OTUNIXERRORS 1
 #include <OpenTransport.h>
 #include <OpenTransportProviders.h>
 #include <OpenTptInternet.h>
 
+#endif
+
 /* Definition of GSocket */
 class GSocket
 {