diff --git a/addons/hr/hr.py b/addons/hr/hr.py
index 5324470e4b5..bd403ce2c42 100644
--- a/addons/hr/hr.py
+++ b/addons/hr/hr.py
@@ -45,7 +45,7 @@ class hr_timesheet_group(osv.osv):
         cycle = 0
         result = []
         while todo>0:
-            cr.execute('select hour_from,hour_to from hr_timesheet where dayofweek=%s and tgroup_id=%d order by hour_from', (dt_from.day_of_week,id))
+            cr.execute("select hour_from,hour_to from hr_timesheet where dayofweek='%s' and tgroup_id=%d order by hour_from", (dt_from.day_of_week,id))
             for (hour_from,hour_to) in cr.fetchall():
                 h1,m1 = map(int,hour_from.split(':'))
                 h2,m2 = map(int,hour_to.split(':'))
diff --git a/addons/hr/report/bymonth.py b/addons/hr/report/bymonth.py
index a2f05b75e2e..98a613608b1 100644
--- a/addons/hr/report/bymonth.py
+++ b/addons/hr/report/bymonth.py
@@ -94,14 +94,14 @@ class report_custom(report_rml):
                      inner join (hr_timesheet_group as g inner join hr_timesheet_employee_rel as rel
                                  on rel.tgroup_id = g.id and rel.emp_id = %s)
                      on t.tgroup_id = g.id
-                where dayofweek = %s 
+                where dayofweek = '%s'
                       and date_from = (select max(date_from) 
                                        from hr_timesheet inner join (hr_timesheet_employee_rel 
                                                                         inner join hr_timesheet_group 
                                                                         on hr_timesheet_group.id = hr_timesheet_employee_rel.tgroup_id
                                                                             and hr_timesheet_employee_rel.emp_id = %s)
                                                          on hr_timesheet.tgroup_id = hr_timesheet_group.id
-                                       where dayofweek = %s and date_from <= '%s') 
+                                       where dayofweek = '%s' and date_from <= '%s') 
                 order by date_from desc
                 '''
                 isPH = False