diff --git a/src/string.c b/src/string.c
--- a/src/string.c
+++ b/src/string.c
*/
#include <ctype.h>
-#ifndef SIZE_MAX
- /* Some versions of VC++
- * has SIZE_MAX in stdint.h
- */
-# include <limits.h>
-#endif
+#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
mrb_int len;
} mrb_shared_string;
-#define MRB_STR_SHARED 1
-#define MRB_STR_NOFREE 2
-
static mrb_value str_replace(mrb_state *mrb, struct RString *s1, struct RString *s2);
static mrb_value mrb_str_subseq(mrb_state *mrb, mrb_value str, mrb_int beg, mrb_int len);
@@ -92,6