diff --git a/lib/apscheduler/triggers/cron/fields.py b/lib/apscheduler/triggers/cron/fields.py
index 86d620c4..064831ed 100644
--- a/lib/apscheduler/triggers/cron/fields.py
+++ b/lib/apscheduler/triggers/cron/fields.py
@@ -104,7 +104,7 @@ class DayOfWeekField(BaseField):
     COMPILERS = BaseField.COMPILERS + [WeekdayRangeExpression]
 
     def get_value(self, dateval):
-        return dateval.weekday()
+        return dateval.isoweekday()
 
 
 class MonthField(BaseField):