diff --git a/bmsapp/reports/timeseries.py b/bmsapp/reports/timeseries.py
index 06e6c2da89dd62c39e335536991e9d921f0f8069..68f5dcc877f30613c10162380eb6aa67d0d0fed3 100644
--- a/bmsapp/reports/timeseries.py
+++ b/bmsapp/reports/timeseries.py
@@ -87,7 +87,6 @@ class TimeSeries(basechart.BaseChart):
         # If there there are more than 20 sensors, hide the legend
         if len(sensor_list) > 20:
             opt['layout']['showlegend'] = False
-            del opt['layout']['margin']['b']
 
         opt['layout']['xaxis']['title'] =  "Date/Time (%s)" % self.timezone
         opt['layout']['xaxis']['type'] =  'date'