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-rw-r--r--vm_dump.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/vm_dump.c b/vm_dump.c
index 741b4ad..e27a64c 100644
--- a/vm_dump.c
+++ b/vm_dump.c
@@ -16,7 +16,7 @@
#define MAX_POSBUF 128
#define VM_CFP_CNT(th, cfp) \
- ((rb_control_frame_t *)(th->stack + th->stack_size) - (rb_control_frame_t *)(cfp))
+ ((rb_control_frame_t *)((th)->stack + (th)->stack_size) - (rb_control_frame_t *)(cfp))
static void
control_frame_dump(rb_thread_t *th, rb_control_frame_t *cfp)