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-rw-r--r--mrbgems/mruby-time/src/time.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-time/src/time.c b/mrbgems/mruby-time/src/time.c
index 3c6959644..99dcb2bcf 100644
--- a/mrbgems/mruby-time/src/time.c
+++ b/mrbgems/mruby-time/src/time.c
@@ -695,7 +695,7 @@ time_zonename(mrb_state *mrb, struct mrb_time *tm, char *buf, size_t len)
datetime.tm_hour = offset / 60;
datetime.tm_min = offset % 60;
buf[0] = utc_sec < tm->sec ? '-' : '+';
- return strftime(buf+1, len, "%H%M", &datetime) + 1;
+ return strftime(buf+1, len-1, "%H%M", &datetime) + 1;
#else
return strftime(buf, len, "%z", &tm->datetime);
#endif