diff --git a/addons/sale_timesheet/models/project.py b/addons/sale_timesheet/models/project.py
index ab2345c0fd8..13d2775fd03 100644
--- a/addons/sale_timesheet/models/project.py
+++ b/addons/sale_timesheet/models/project.py
@@ -356,7 +356,7 @@ class ProjectTask(models.Model):
         if not self.commercial_partner_id or not self.allow_billable:
             return False
         domain = [('is_service', '=', True), ('order_partner_id', 'child_of', self.commercial_partner_id.id), ('is_expense', '=', False), ('state', 'in', ['sale', 'done'])]
-        if self.project_id.bill_type == 'customer_type' and self.project_sale_order_id:
+        if self.project_id.bill_type == 'customer_project' and self.project_sale_order_id:
             domain.append(('order_id', '=?', self.project_sale_order_id.id))
         sale_lines = self.env['sale.order.line'].search(domain)
         for line in sale_lines: