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-rw-r--r--gc/default/default.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/gc/default/default.c b/gc/default/default.c
index da1438c2fe..6d5e7a35a3 100644
--- a/gc/default/default.c
+++ b/gc/default/default.c
@@ -2774,7 +2774,11 @@ rb_gc_impl_undefine_finalizer(void *objspace_ptr, VALUE obj)
GC_ASSERT(!OBJ_FROZEN(obj));
st_data_t data = obj;
+
+ int lev = rb_gc_vm_lock();
st_delete(finalizer_table, &data, 0);
+ rb_gc_vm_unlock(lev);
+
FL_UNSET(obj, FL_FINALIZE);
}