diff --git a/mrp_production_request/models/mrp_production_request.py b/mrp_production_request/models/mrp_production_request.py
index 7b9786ad1..f5cdde048 100644
--- a/mrp_production_request/models/mrp_production_request.py
+++ b/mrp_production_request/models/mrp_production_request.py
@@ -233,7 +233,7 @@ class MrpProductionRequest(models.Model):
         valid_states = self._get_mo_valid_states()
         for req in self:
             done_mo = req.mrp_production_ids.filtered(
-                lambda mo: mo.state in "done"
+                lambda mo: mo.state == "done"
             ).mapped("product_qty")
             req.done_qty = sum(done_mo)
             valid_mo = req.mrp_production_ids.filtered(