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-rw-r--r--src/backtrace.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/backtrace.c b/src/backtrace.c
index c9a223e07..8001849bc 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -26,7 +26,7 @@ typedef void (*each_backtrace_func)(mrb_state*, const struct backtrace_location*
static const mrb_data_type bt_type = { "Backtrace", mrb_free };
static void
-each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, mrb_code *pc0, each_backtrace_func func, void *data)
+each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, const mrb_code *pc0, each_backtrace_func func, void *data)
{
ptrdiff_t i;
@@ -37,7 +37,7 @@ each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, mrb_code *pc0, each_backtrace_fu
struct backtrace_location loc;
mrb_callinfo *ci;
mrb_irep *irep;
- mrb_code *pc;
+ const mrb_code *pc;
ci = &mrb->c->cibase[i];