diff --git a/chrono/manager/views.py b/chrono/manager/views.py
index 49ee8258..91a574d9 100644
--- a/chrono/manager/views.py
+++ b/chrono/manager/views.py
@@ -459,6 +459,8 @@ class AgendaMonthView(AgendaDateView, MonthArchiveView):
         )
 
         first_week_number = self.date.isocalendar()[1]
+        if first_week_number >= 52:
+            first_week_number = 0
         last_month_day = self.get_next_month(self.date.date()) - datetime.timedelta(days=1)
         last_week_number = last_month_day.isocalendar()[1]
 
diff --git a/tests/test_manager.py b/tests/test_manager.py
index 1034de00..9f67b3f7 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -1952,6 +1952,21 @@ def test_agenda_month_view_dst_change(app, admin_user, manager_user, api_user):
     assert resp.text.count('height:33.0%;top:100.0%;') == 2
 
 
+def test_agenda_month_view_januaries(app, admin_user, manager_user, api_user):
+    agenda = Agenda.objects.create(label='Passports', kind='meetings')
+    desk = Desk.objects.create(agenda=agenda, label='Desk A')
+    meetingtype = MeetingType(agenda=agenda, label='passport', duration=20)
+    meetingtype.save()
+    TimePeriod(desk=desk, weekday=2, start_time=datetime.time(9, 0), end_time=datetime.time(12, 0)).save()
+
+    for year in range(2020, 2030):
+        date = datetime.date(year, 1, 1)
+        with freezegun.freeze_time(date):
+            login(app)
+            resp = app.get('/manage/agendas/%s/%s/1/' % (agenda.id, date.year))
+            assert resp.text.count('<th></th>') in (4, 5)
+
+
 def test_agenda_view_event(app, manager_user):
     agenda = Agenda(label=u'Foo bar')
     agenda.view_role = manager_user.groups.all()[0]