1 files changed, 5 insertions, 13 deletions
diff --git a/src/string.c b/src/string.c
index dd0889d92..b2a625eea 100644
--- a/src/string.c
+++ b/src/string.c
@@ -1351,8 +1351,7 @@ static mrb_value
 mrb_str_index_m(mrb_state *mrb, mrb_value str)
 {
   mrb_value *argv;
-  int argc;
-
+  mrb_int argc;
   mrb_value sub;
   mrb_int pos;
 
@@ -1695,7 +1694,7 @@ static mrb_value
 mrb_str_rindex_m(mrb_state *mrb, mrb_value str)
 {
   mrb_value *argv;
-  int argc;
+  mrb_int argc;
   mrb_value sub;
   mrb_value vpos;
   mrb_int pos, len = RSTRING_LEN(str);
@@ -2104,7 +2103,7 @@ mrb_string_value_cstr(mrb_state *mrb, mrb_value *ptr)
 }
 
 mrb_value
-mrb_str_to_inum(mrb_state *mrb, mrb_value str, int base, mrb_bool badcheck)
+mrb_str_to_inum(mrb_state *mrb, mrb_value str, mrb_int base, mrb_bool badcheck)
 {
   char *s;
   mrb_int len;
@@ -2150,16 +2149,9 @@ mrb_str_to_inum(mrb_state *mrb, mrb_value str, int base, mrb_bool badcheck)
 static mrb_value
 mrb_str_to_i(mrb_state *mrb, mrb_value self)
 {
-  mrb_value *argv;
-  int argc;
-  int base;
-
-  mrb_get_args(mrb, "*", &argv, &argc);
-  if (argc == 0)
-    base = 10;
-  else
-    base = mrb_fixnum(argv[0]);
+  mrb_int base = 10;
 
+  mrb_get_args(mrb, "|i", &base);
   if (base < 0) {
     mrb_raisef(mrb, E_ARGUMENT_ERROR, "illegal radix %S", mrb_fixnum_value(base));
   }