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-rw-r--r--vm_insnhelper.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index c2256471bd..d0ab1f34c5 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -765,7 +765,7 @@ vm_setivar(VALUE obj, ID id, VALUE val, IC ic, rb_call_info_t *ci, int is_attr)
if (LIKELY(
(!is_attr && ic->ic_serial == RCLASS_SERIAL(klass)) ||
(is_attr && ci->aux.index > 0))) {
- long index = !is_attr ? (long)ic->ic_value.index : ci->aux.index-1;
+ long index = !is_attr ? (long)ic->ic_value.index : (long)ci->aux.index-1;
long len = ROBJECT_NUMIV(obj);
VALUE *ptr = ROBJECT_IVPTR(obj);