diff --git a/games/pom/pom.c b/games/pom/pom.c
index afc57cbcc439..d56932e7b36d 100644
--- a/games/pom/pom.c
+++ b/games/pom/pom.c
@@ -84,7 +84,7 @@ main()
 	days = (GMT->tm_yday + 1) + ((GMT->tm_hour +
 	    (GMT->tm_min / 60.0) + (GMT->tm_sec / 3600.0)) / 24.0);
 	for (cnt = EPOCH; cnt < GMT->tm_year; ++cnt)
-		days += isleap(cnt) ? 366 : 365;
+		days += isleap(1900 + cnt) ? 366 : 365;
 	today = potm(days) + .5;
 	(void)printf("The Moon is ");
 	if ((int)today == 100)