diff --git a/sceneitems/annotationitem.py b/sceneitems/annotationitem.py
index 2c7c156..b6ca860 100644
--- a/sceneitems/annotationitem.py
+++ b/sceneitems/annotationitem.py
@@ -1,5 +1,6 @@
 from PyQt4.QtGui import *
 from PyQt4.Qt import *
+import math
 from annotationmodel import DataRole
 
 class ControlItem(QGraphicsItem):