diff --git a/branches/follower/wiz810mj/src/lib/types.h b/branches/follower/wiz810mj/src/lib/types.h
index b9a9181..2ebb539 100644
--- a/branches/follower/wiz810mj/src/lib/types.h
+++ b/branches/follower/wiz810mj/src/lib/types.h
@@ -100,7 +100,9 @@
 #define NULL		((void *) 0)
 #endif
 
+#ifndef __ARDUINO__
 typedef enum { false, true } bool;
+#endif
 
 #ifndef _SIZE_T
 #define _SIZE_T