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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 d0063529d..027eceb10 100644
--- a/src/class.c
+++ b/src/class.c
@@ -1444,4 +1444,5 @@ mrb_init_class(mrb_state *mrb)
mrb_define_method(mrb, mod, "===", mrb_mod_eqq, ARGS_REQ(1));
mrb_undef_method(mrb, cls, "append_features");
+ mrb_undef_method(mrb, cls, "extend_object");
}