Pin keys of this st_table

1 files changed, 1 insertions, 1 deletions

diff --git a/compile.c b/compile.c
index 72b60c1144..a478324261 100644
--- a/compile.c
+++ b/compile.c
@@ -9039,7 +9039,7 @@ rb_iseq_build_from_ary(rb_iseq_t *iseq, VALUE misc, VALUE locals, VALUE params,
     unsigned int arg_size, local_size, stack_max;
     ID *tbl;
     struct st_table *labels_table = st_init_numtable();
-    VALUE labels_wrapper = Data_Wrap_Struct(0, 0, st_free_table, labels_table);
+    VALUE labels_wrapper = Data_Wrap_Struct(0, rb_mark_set, st_free_table, labels_table);
     VALUE arg_opt_labels = rb_hash_aref(params, SYM(opt));
     VALUE keywords = rb_hash_aref(params, SYM(keyword));
     VALUE sym_arg_rest = ID2SYM(rb_intern("#arg_rest"));