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-rw-r--r--src/variable.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/variable.c b/src/variable.c
index 0d8b76863..dce598835 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -378,7 +378,7 @@ assign_class_name(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v)
{
if (namespace_p(obj->tt) && namespace_p(mrb_type(v))) {
struct RObject *c = mrb_obj_ptr(v);
- if (obj != c && ISUPPER(mrb_sym_name(mrb, sym)[0])) {
+ if (obj != c && ISUPPER(mrb_sym_name_len(mrb, sym, NULL)[0])) {
mrb_sym id_classname = mrb_intern_lit(mrb, "__classname__");
mrb_value o = mrb_obj_iv_get(mrb, c, id_classname);