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-rw-r--r--src/core/expandos.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/core/expandos.c b/src/core/expandos.c
index fd4ee5e6..90288bf6 100644
--- a/src/core/expandos.c
+++ b/src/core/expandos.c
@@ -481,7 +481,7 @@ static int sig_timer(void)
/* check if $Z has changed */
now = time(NULL);
if (last_timestamp != now) {
- if (!timestamp_seconds) {
+ if (!timestamp_seconds && last_timestamp != 0) {
/* assume it changes every minute */
tm = localtime(&last_timestamp);
last_min = tm->tm_min;