diff --git a/app/include/arch/cc.h b/app/include/arch/cc.h
index ff03b307..48da48a8 100644
--- a/app/include/arch/cc.h
+++ b/app/include/arch/cc.h
@@ -38,7 +38,10 @@
 #include "c_types.h"
 #include "ets_sys.h"
 #include "osapi.h"
+
+#ifndef EFAULT
 #define EFAULT 14
+#endif
 
 //#define LWIP_PROVIDE_ERRNO