diff --git a/addons/mrp/report/workcenter_load.py b/addons/mrp/report/workcenter_load.py
index befde4d8667..95331d6fdf0 100644
--- a/addons/mrp/report/workcenter_load.py
+++ b/addons/mrp/report/workcenter_load.py
@@ -30,6 +30,8 @@ from report.misc import choice_colors
 import random
 import StringIO
 
+from pychart import *
+
 
 theme.use_color = 1
 random.seed(0)