1 files changed, 1 insertions, 0 deletions
diff --git a/ref-filter.c b/ref-filter.c
index 8c5e673fc0..54880a2497 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1628,6 +1628,7 @@ static void grab_date(const char *buf, struct atom_value *v, const char *atomnam
 	timestamp = parse_timestamp(eoemail + 2, &zone, 10);
 	if (timestamp == TIME_MAX)
 		goto bad;
+	errno = 0;
 	tz = strtol(zone, NULL, 10);
 	if ((tz == LONG_MIN || tz == LONG_MAX) && errno == ERANGE)
 		goto bad;