diff --git a/stock_usability/models/stock_move.py b/stock_usability/models/stock_move.py
index 387e0f1..ab25ee2 100644
--- a/stock_usability/models/stock_move.py
+++ b/stock_usability/models/stock_move.py
@@ -37,7 +37,7 @@ class StockMove(models.Model):
             picking = move.picking_id
             if picking:
                 product = move.product_id
-                picking.message_post(_(
+                picking.message_post(body=_(
                     "Product <a href=# data-oe-model=product.product "
                     "data-oe-id=%d>%s</a> qty %s %s <b>unreserved</b>")
                     % (product.id, product.display_name,
@@ -60,7 +60,7 @@ class StockMoveLine(models.Model):
             picking = moveline.move_id.picking_id
             if picking:
                 product = moveline.product_id
-                picking.message_post(_(
+                picking.message_post(body=_(
                     "Product <a href=# data-oe-model=product.product "
                     "data-oe-id=%d>%s</a> qty %s %s <b>unreserved</b>")
                     % (product.id, product.display_name,