diff --git a/mrp_operations_extension/models/mrp_production.py b/mrp_operations_extension/models/mrp_production.py
index 3f3b53397..cf1bc9b6b 100644
--- a/mrp_operations_extension/models/mrp_production.py
+++ b/mrp_operations_extension/models/mrp_production.py
@@ -133,4 +133,6 @@ class MrpProductionWorkcenterLine(models.Model):
                     ['assigned', 'cancel', 'done']):
                 raise exceptions.Warning(
                     _("Missing materials to start the production"))
+            if workorder.production_id.state in ('confirmed', 'ready'):
+                workorder.production_id.state = 'in_production'
         return super(MrpProductionWorkcenterLine, self).action_start_working()