diff --git a/wcs_olap/feeder.py b/wcs_olap/feeder.py
index ac6b4d2..66f29e1 100644
--- a/wcs_olap/feeder.py
+++ b/wcs_olap/feeder.py
@@ -246,6 +246,7 @@ class WcsOlapFeeder(object):
         [2, 'mail', u'courrier'],
         [3, 'phone', u'téléphone'],
         [4, 'counter', u'guichet'],
+        [5, 'backoffice', u'backoffice'],
     ]
     channel_to_id = dict((c[1], c[0]) for c in channels)
     id_to_channel = dict((c[0], c[1]) for c in channels)
@@ -484,11 +485,14 @@ class WcsFormdefFeeder(object):
                 continue
 
             status = data.formdef.schema.workflow.statuses_map[data.workflow.status.id]
+            channel = data.submission.channel.lower()
+            if channel == 'web' and data.submission.backoffice:
+                channel = 'backoffice'
             row = {
                 'formdef_id': self.formdef_sql_id,
                 'receipt_time': data.receipt_time,
                 'hour_id': data.receipt_time.hour,
-                'channel_id': self.channel_to_id[data.submission.channel.lower()],
+                'channel_id': self.channel_to_id[channel],
                 'backoffice': data.submission.backoffice,
                 # FIXME "En cours"/2 is never used
                 'generic_status_id': 3 if status.endpoint else 1,