diff --git a/time.c b/time.c
index 3a004f8763..e7faef6df6 100644
--- a/time.c
+++ b/time.c
@@ -1110,7 +1110,7 @@ gmtime_with_leapsecond(const time_t *timep, struct tm *result)
                 result->tm_yday = leap_year_p(result->tm_year + 1900) ? 365 : 364;
             }
             else if (result->tm_mday == 1) {
-                const int8_t *days_in_month = days_in_month_of(result->tm_year + 1900);
+                const int8_t *days_in_month = days_in_month_in(result->tm_year + 1900);
                 result->tm_mon--;
                 result->tm_mday = days_in_month[result->tm_mon];
                 result->tm_yday--;