1 files changed, 1 insertions, 1 deletions
diff --git a/marshal.c b/marshal.c
index 557436894a..9a43cdb4d1 100644
--- a/marshal.c
+++ b/marshal.c
@@ -824,7 +824,7 @@ w_object(VALUE obj, struct dump_arg *arg, int limit)
 
 		if (!rb_respond_to(obj, s_dump_data)) {
 		    rb_raise(rb_eTypeError,
-			     "no marshal_dump is defined for class %s",
+			     "no _dump_data is defined for class %s",
 			     rb_obj_classname(obj));
 		}
 		v = rb_funcall(obj, s_dump_data, 0);