diff --git a/test-s390x.c b/test-s390x.c
index 1bf1b38..8e213a2 100644
--- a/test-s390x.c
+++ b/test-s390x.c
@@ -239,5 +239,5 @@ int main()
   unsigned long int hours_since_1900 = ((unsigned long)now / 3600) - hourswest + 613608;
   unsigned long int days_since_1900 = (hours_since_1900 + 6) / 24;
   int candles = hebrew_calendar_hanukka_candles(days_since_1900);
-  return printf("candles = %d\n", candles) > 0;
+  return printf("candles = %d\n", candles) > 0 ? 0 : 1;
 }