1 files changed, 1 insertions, 1 deletions
diff --git a/src/string.c b/src/string.c
index f50468cca..54987ca64 100644
--- a/src/string.c
+++ b/src/string.c
@@ -488,7 +488,7 @@ check_frozen(mrb_state *mrb, struct RString *s)
 static mrb_value
 str_replace(mrb_state *mrb, struct RString *s1, struct RString *s2)
 {
-  long len;
+  mrb_int len;
 
   check_frozen(mrb, s1);
   if (s1 == s2) return mrb_obj_value(s1);