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-rw-r--r--yarvcore.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/yarvcore.c b/yarvcore.c
index 7d6869ad5b..883ae8252d 100644
--- a/yarvcore.c
+++ b/yarvcore.c
@@ -266,7 +266,7 @@ thread_mark(void *ptr)
th = ptr;
if (th->stack) {
VALUE *p = th->stack;
- VALUE *sp = th->cfp->sp;
+ VALUE *sp = th->cfp->sp + th->mark_stack_len;
rb_control_frame_t *cfp = th->cfp;
rb_control_frame_t *limit_cfp =
(void *)(th->stack + th->stack_size);