diff --git a/src/moon.c b/src/moon.c
index 2b7477ef..46db4c3b 100644
--- a/src/moon.c
+++ b/src/moon.c
@@ -811,7 +811,7 @@ static void test_moon_event(int k, double offset_days, struct MoonInfo *moon_inf
     if ((VHz[0] < 0) && (VHz[2] > 0)) {
         if (!moon_info->hasRise ||
             ((moon_info->riseTime < moon_info->queryTime) == (eventTime < moon_info->queryTime) &&
-             labs(moon_info->riseTime - moon_info->queryTime) > labs(eventTime - moon_info->queryTime)) ||
+             llabs(moon_info->riseTime - moon_info->queryTime) > llabs(eventTime - moon_info->queryTime)) ||
             ((moon_info->riseTime < moon_info->queryTime) != (eventTime < moon_info->queryTime) &&
              (moon_info->hasSet && 
               (moon_info->riseTime < moon_info->queryTime) == (moon_info->setTime < moon_info->queryTime)))) {
@@ -823,7 +823,7 @@ static void test_moon_event(int k, double offset_days, struct MoonInfo *moon_inf
     if ((VHz[0] > 0) && (VHz[2] < 0)) {
         if (!moon_info->hasSet ||
             ((moon_info->setTime < moon_info->queryTime) == (eventTime < moon_info->queryTime) &&
-             labs(moon_info->setTime - moon_info->queryTime) > labs(eventTime - moon_info->queryTime)) ||
+             llabs(moon_info->setTime - moon_info->queryTime) > llabs(eventTime - moon_info->queryTime)) ||
             ((moon_info->setTime < moon_info->queryTime) != (eventTime < moon_info->queryTime) &&
              (moon_info->hasRise && 
               (moon_info->setTime < moon_info->queryTime) == (moon_info->riseTime < moon_info->queryTime)))) {