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-rw-r--r--src/backtrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backtrace.c b/src/backtrace.c
index 392ce4e07..19a54b7e5 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -168,7 +168,7 @@ static mrb_value
packed_backtrace(mrb_state *mrb)
{
struct RData *backtrace;
- mrb_int ciidx = mrb->c->ci - mrb->c->cibase;
+ ptrdiff_t ciidx = mrb->c->ci - mrb->c->cibase;
mrb_int len = (ciidx+1)*sizeof(struct backtrace_location);
void *ptr;