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-rw-r--r--marshal.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/marshal.c b/marshal.c
index b38c53c..9587783 100644
--- a/marshal.c
+++ b/marshal.c
@@ -893,8 +893,8 @@ w_object(VALUE obj, struct dump_arg *arg, int limit)
if (!rb_obj_respond_to(obj, s_dump_data, TRUE)) {
rb_raise(rb_eTypeError,
- "no _dump_data is defined for class %s",
- rb_obj_classname(obj));
+ "no _dump_data is defined for class %"PRIsVALUE,
+ rb_obj_class(obj));
}
v = rb_funcall2(obj, s_dump_data, 0, 0);
check_dump_arg(arg, s_dump_data);