1 files changed, 2 insertions, 2 deletions
diff --git a/src/variable.c b/src/variable.c
index 3e451df05..efe6fad12 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -563,7 +563,7 @@ MRB_API void
 mrb_iv_check(mrb_state *mrb, mrb_sym iv_name)
 {
   if (!mrb_iv_p(mrb, iv_name)) {
-    mrb_name_error(mrb, iv_name, "`%S' is not allowed as an instance variable name", mrb_sym2str(mrb, iv_name));
+    mrb_name_error(mrb, iv_name, "'%S' is not allowed as an instance variable name", mrb_sym2str(mrb, iv_name));
   }
 }
 
@@ -609,7 +609,7 @@ inspect_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)
   else {
     ins = mrb_inspect(mrb, v);
   }
-  mrb_str_append(mrb, str, ins);
+  mrb_str_cat_str(mrb, str, ins);
   return 0;
 }