diff --git a/account.py b/account.py
index 972e64ec77..3be9f12523 100644
--- a/account.py
+++ b/account.py
@@ -50,7 +50,7 @@ class InvoiceLine:
 
     @fields.depends('origin')
     def on_change_product(self):
-        return super(InvoiceLine, self).on_change_product()
+        super(InvoiceLine, self).on_change_product()
 
     @fields.depends('origin')
     def on_change_account(self):
diff --git a/purchase.py b/purchase.py
index 435ab8f338..928a5fb77e 100644
--- a/purchase.py
+++ b/purchase.py
@@ -42,4 +42,4 @@ class PurchaseLine:
     @fields.depends('_parent_purchase.warehouse',
         '_parent_purchase.invoice_address')
     def on_change_product(self):
-        return super(PurchaseLine, self).on_change_product()
+        super(PurchaseLine, self).on_change_product()
diff --git a/sale.py b/sale.py
index 746addb44d..3567999490 100644
--- a/sale.py
+++ b/sale.py
@@ -48,4 +48,4 @@ class SaleLine:
 
     @fields.depends('_parent_sale.warehouse', '_parent_sale.shipment_address')
     def on_change_product(self):
-        return super(SaleLine, self).on_change_product()
+        super(SaleLine, self).on_change_product()