diff --git a/include/mrbconf.h b/include/mrbconf.h
index 45a5afabb..0113136d6 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -7,9 +7,6 @@
 #ifndef MRUBYCONF_H
 #define MRUBYCONF_H
 
-#if defined(__cplusplus)
-#define __STDC_LIMIT_MACROS
-#endif
 #include <stdint.h>
 
 /* configuration options: */