2 files changed, 10 insertions, 3 deletions
diff --git a/include/mrbconf.h b/include/mrbconf.h
index f87e2ef43..478b79019 100644
--- a/include/mrbconf.h
+++ b/include/mrbconf.h
@@ -8,12 +8,19 @@
 #define MRUBYCONF_H
 
 #include <stdint.h>
+#define MRB_USE_FLOAT
+
+#ifdef MRB_USE_FLOAT
+typedef float mrb_float;
+#define readfloat(p) strtof((p),NULL)
+#else
 typedef double mrb_float;
+#define readfloat(p) strtod((p),NULL)
+#endif
+
 typedef int32_t mrb_int;
 typedef intptr_t mrb_sym;
-
 #define readint(p,base) strtol((p),NULL,(base))
-#define readfloat(p) strtod((p),NULL)
 
 #undef  INCLUDE_ENCODING   /* not use encoding classes (ascii only) */
 #define INCLUDE_ENCODING   /* use UTF-8 encoding classes */
diff --git a/include/mruby/string.h b/include/mruby/string.h
index ea9ca71ec..d35a5fe53 100644
--- a/include/mruby/string.h
+++ b/include/mruby/string.h
@@ -29,7 +29,7 @@ struct RString {
   long len;
   union {
     size_t capa;
-    mrb_value shared;
+    struct RString *shared;
   } aux;
   char *buf;
 };