diff --git a/core/service.h b/core/service.h
index 3d5e06c..e3267db 100644
--- a/core/service.h
+++ b/core/service.h
@@ -67,7 +67,7 @@ public:
         return ret;
     }
 
-    virtual void save(QSharedPointer<T> entity) {
+    void save(QSharedPointer<T> entity) {
         if (!checkPermission(PERM_ADD)) {
             return;
         }
@@ -93,7 +93,7 @@ public:
         emit dataChanged();
     }
 
-    virtual void update(QSharedPointer<T> entity) {
+    void update(QSharedPointer<T> entity) {
         if (!checkPermission(PERM_EDIT)) {
             return;
         }
diff --git a/shop/shopform.cpp b/shop/shopform.cpp
index cb7c69d..e2cc34a 100644
--- a/shop/shopform.cpp
+++ b/shop/shopform.cpp
@@ -122,11 +122,11 @@ void ShopForm::onCountChanged()
 
     if (m_voucher->status() == Voucher::NEW && m_voucher->id() == 0)
     {
-        srv.save(m_voucher);
+        srv.saveVoucher(m_voucher);
     }
     else
     {
-        srv.update(m_voucher);
+        srv.updateVoucher(m_voucher);
     }
 }
 
@@ -147,7 +147,7 @@ void ShopForm::doTempSave(bool comboChanged)
         if (!m_voucher->items().isEmpty())
         {
             m_voucher->setStatus(Voucher::TEMPORARY);
-            srv.update(m_voucher);
+            srv.updateVoucher(m_voucher);
         }
 
         if (comboChanged && ui->receiptCombo->currentIndex() > 0)
@@ -176,7 +176,7 @@ void ShopForm::changeReceipt()
     srv.loadItems(m_voucher);
     connectItemSignals();
     m_voucher->setStatus(Voucher::NEW);
-    srv.update(m_voucher);
+    srv.updateVoucher(m_voucher);
 
     m_itemsModel->setData(m_voucher->items());
     ui->total->setText(m_voucher->totalPrice().toString());
diff --git a/shop/shopservice.cpp b/shop/shopservice.cpp
index 126cd66..5bd7964 100644
--- a/shop/shopservice.cpp
+++ b/shop/shopservice.cpp
@@ -124,7 +124,7 @@ QDecDouble ShopService::vatRate(Enums::VatType vatType)
     return vatRate;
 }
 
-void ShopService::save(QSharedPointer<Voucher> entity)
+void ShopService::saveVoucher(QSharedPointer<Voucher> entity)
 {
     Transaction tr;
     odb::database *db = Context::instance().db();
@@ -139,7 +139,7 @@ void ShopService::save(QSharedPointer<Voucher> entity)
     tr.commit();
 }
 
-void ShopService::update(QSharedPointer<Voucher> entity)
+void ShopService::updateVoucher(QSharedPointer<Voucher> entity)
 {
     Transaction tr;
     odb::database *db = Context::instance().db();
diff --git a/shop/shopservice.h b/shop/shopservice.h
index 82d8941..5b70012 100644
--- a/shop/shopservice.h
+++ b/shop/shopservice.h
@@ -26,10 +26,9 @@ private:
     QSharedPointer<GlobalSettings> m_gs;
     QDecDouble vatRate(Enums::VatType vatType);
 
-    // Service interface
 public:
-    virtual void save(QSharedPointer<Voucher> entity) override;
-    virtual void update(QSharedPointer<Voucher> entity) override;
+    void saveVoucher(QSharedPointer<Voucher> entity);
+    void updateVoucher(QSharedPointer<Voucher> entity);
 };
 
 #endif // SHOPSERVICE_H