diff --git a/include/mrbconf.h b/include/mrbconf.h
index 4963634e3..27cf68d00 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -17,7 +17,7 @@ typedef double mrb_float;
 #endif
 #define readfloat(p) (mrb_float)strtod((p),NULL)
 
-typedef int32_t mrb_int;
+typedef int mrb_int;
 typedef intptr_t mrb_sym;
 #define readint(p,base) strtol((p),NULL,(base))