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-rw-r--r--src/class.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/class.c b/src/class.c
index 2784327f3..e1a325b51 100644
--- a/src/class.c
+++ b/src/class.c
@@ -1441,4 +1441,5 @@ mrb_init_class(mrb_state *mrb)
mrb_define_method(mrb, mod, "define_method", mod_define_method, ARGS_REQ(1));
mrb_define_method(mrb, mod, "===", mrb_mod_eqq, ARGS_REQ(1));
+ mrb_undef_method(mrb, cls, "append_features");
}