--- qof/qofdate.c.orig	2016-01-09 06:26:38.000000000 -0800
+++ qof/qofdate.c	2016-01-09 06:27:28.000000000 -0800
@@ -827,7 +827,7 @@
 	if (qd->qd_wday < 0)
 		qd->qd_wday += 7;
 	y = 1970;
-	while (days < 0 || days >= (__isleap (y) ? 366 : 365))
+	while (days < 0 || days >= ((qof_date_isleap(y)) ? 366 : 365))
 	{
 		/* Guess a corrected year, assuming 365 days per year.  */
 		yg = y + days / 365 - (days % 365 < 0);