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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 b0d7c8aa0..77b670496 100644
--- a/src/class.c
+++ b/src/class.c
@@ -431,6 +431,7 @@ mrb_define_method_raw(mrb_state *mrb, struct RClass *c, mrb_sym mid, struct RPro
k = kh_put(mt, mrb, h, mid);
kh_value(h, k) = p;
if (p) {
+ p->c = NULL;
mrb_field_write_barrier(mrb, (struct RBasic *)c, (struct RBasic *)p);
}
}