diff --git a/addons/stock/stock.py b/addons/stock/stock.py
index a4c7324dafd..ceb9e98221e 100644
--- a/addons/stock/stock.py
+++ b/addons/stock/stock.py
@@ -2832,6 +2832,7 @@ class stock_inventory_line(osv.osv):
 
     _defaults = {
         'product_qty': 0,
+        'product_uom_id': lambda self, cr, uid, ctx=None: self.pool['ir.model.data'].get_object_reference(cr, uid, 'product', 'product_uom_unit')[1]
     }
 
     def _get_quants(self, cr, uid, line, context=None):