diff --git a/apscheduler/triggers/interval.py b/apscheduler/triggers/interval.py
index d8700b28..a8bed038 100644
--- a/apscheduler/triggers/interval.py
+++ b/apscheduler/triggers/interval.py
@@ -1,7 +1,6 @@
 from datetime import timedelta, datetime
 from math import ceil
 
-import six
 from tzlocal import get_localzone
 
 from apscheduler.triggers.base import BaseTrigger