diff --git a/xmlschemastypes.c b/xmlschemastypes.c
index 97de1473..e98e98ce 100644
--- a/xmlschemastypes.c
+++ b/xmlschemastypes.c
@@ -1403,7 +1403,7 @@ static const unsigned int daysInMonthLeap[12] =
 	((dt)->hour == 24 && (dt)->min == 0 && (dt)->sec == 0)
 
 #define VALID_TIME(dt)						\
-	(((VALID_HOUR((int)dt->hour) && VALID_MIN((int)dt->min) &&	\
+	((((dt->hour < 24) && (dt->min < 60) &&           \
 	  VALID_SEC(dt->sec)) || VALID_END_OF_DAY(dt)) &&	\
 	 VALID_TZO(dt->tzo))