--- a/ckanext/ga_report/controller.py
+++ b/ckanext/ga_report/controller.py
@@ -34,7 +34,7 @@
             filter(GA_Stat.period_name==month).\
             order_by('GA_Stat.stat_name, GA_Stat.key').all()
 
-        response.headers['Content-disposition'] = 'attachment; filename=dgu_analytics_%s.csv' % (month)
+        response.headers['Content-disposition'] = 'attachment; filename=dgu_analytics_%s.csv' % (month,)
         response.headers['Content-Type'] = "text/csv; charset=utf-8"
 
         writer = csv.writer(response)
@@ -88,6 +88,7 @@
     """
 
     def index(self):
+
         # Get the month details by fetching distinct values and determining the
         # month names from the values.
         c.months = _month_details(GA_Url)