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-rw-r--r--src/time.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/time.c b/src/time.c
index 28cc3c1a3..3da824e82 100644
--- a/src/time.c
+++ b/src/time.c
@@ -435,7 +435,7 @@ mrb_time_asctime(mrb_state *mrb, mrb_value self)
tm = mrb_get_datatype(mrb, self, &mrb_time_type);
if (!tm) return mrb_nil_value();
d = &tm->datetime;
- len = snprintf(buf, 256, "%s %s %02d %02d:%02d:%02d %s%d",
+ len = snprintf(buf, sizeof(buf), "%s %s %02d %02d:%02d:%02d %s%d",
wday_names[d->tm_wday], mon_names[d->tm_mon], d->tm_mday,
d->tm_hour, d->tm_min, d->tm_sec,
tm->timezone == MRB_TIMEZONE_UTC ? "UTC " : "",