diff --git a/addons/mrp_operations/mrp_operations.py b/addons/mrp_operations/mrp_operations.py
index ec087cf6877..908f4943181 100644
--- a/addons/mrp_operations/mrp_operations.py
+++ b/addons/mrp_operations/mrp_operations.py
@@ -295,7 +295,8 @@ class mrp_production(osv.osv):
                 if l.state in ('done','cancel','draft'):
                     continue
                 todo += l.move_dest_id_lines
-                if l.production_id and (l.production_id.date_finished > dt):
+                date_end = l.production_id.date_finished
+                if date_end and datetime.strptime(date_end, '%Y-%m-%d %H:%M:%S') > dt:
                     if l.production_id.state not in ('done','cancel'):
                         for wc in l.production_id.workcenter_lines:
                             i = self.pool.get('resource.calendar').interval_min_get(