diff --git a/bijoe/schemas.py b/bijoe/schemas.py
index 3679a17..07dd268 100644
--- a/bijoe/schemas.py
+++ b/bijoe/schemas.py
@@ -169,6 +169,18 @@ class Dimension(Base):
                     value='EXTRACT(dow from %s)' % self.value,
                     value_label='to_char(date_trunc(\'week\', current_date)::date '
                                 '+ EXTRACT(dow from %s)::integer, \'TMday\')' % self.value,
+                    filter=False),
+                Dimension(
+                    label=u'semaine (%s)' % self.label,
+                    name=self.name + '__isoweek',
+                    type='integer',
+                    join=self.join,
+                    value='EXTRACT(isoyear from %s) || \'S\' || EXTRACT(week from %s)'
+                          % (self.value, self.value),
+                    group_by='EXTRACT(isoyear from %s), EXTRACT(week from %s)' % (self.value,
+                                                                                  self.value),
+                    order_by='EXTRACT(isoyear from %s), EXTRACT(week from %s)' % (self.value,
+                                                                                  self.value),
                     filter=False)
             ]
         return [self]