diff --git a/addons/account_asset/account_asset.py b/addons/account_asset/account_asset.py
index 97aec1d8487..8b589a7c6df 100644
--- a/addons/account_asset/account_asset.py
+++ b/addons/account_asset/account_asset.py
@@ -337,7 +337,7 @@ class account_asset_depreciation_line(osv.osv):
         'amount': fields.float('Depreciation Amount', required=True),
         'remaining_value': fields.float('Amount to Depreciate', required=True),
         'depreciated_value': fields.float('Amount Already Depreciated', required=True),
-        'depreciation_date': fields.char('Depreciation Date', size=64, select=1),
+        'depreciation_date': fields.date('Depreciation Date', select=1),
         'move_id': fields.many2one('account.move', 'Depreciation Entry'),
         'move_check': fields.function(_get_move_check, method=True, type='boolean', string='Posted', store=True)
     }
diff --git a/addons/account_asset/report/account_asset_report.py b/addons/account_asset/report/account_asset_report.py
index a7d9adf00f9..6c183c4c037 100644
--- a/addons/account_asset/report/account_asset_report.py
+++ b/addons/account_asset/report/account_asset_report.py
@@ -50,7 +50,7 @@ class asset_asset_report(osv.osv):
                 select 
                     min(dl.id) as id,
                     dl.name as name,
-                    to_date(dl.depreciation_date, 'YYYY-MM-DD') as depreciation_date,
+                    dl.depreciation_date as depreciation_date,
                     a.purchase_date as purchase_date,
                     (CASE WHEN (select min(d.id) from account_asset_depreciation_line as d
                                 left join account_asset_asset as ac ON (ac.id=d.asset_id)
@@ -77,7 +77,7 @@ class asset_asset_report(osv.osv):
                 from account_asset_depreciation_line dl
                     left join account_asset_asset a on (dl.asset_id=a.id)
                 group by 
-                    dl.amount,dl.asset_id,to_date(dl.depreciation_date, 'YYYY-MM-DD'),dl.name,
+                    dl.amount,dl.asset_id,dl.depreciation_date,dl.name,
                     a.purchase_date, dl.move_check, a.state, a.category_id, a.partner_id, a.company_id,
                     a.purchase_value, a.id, a.salvage_value
         )""")