diff --git a/src/wallet/MoneroWalletModel.cpp b/src/wallet/MoneroWalletModel.cpp
index b7ffc6c..09a7c7c 100644
--- a/src/wallet/MoneroWalletModel.cpp
+++ b/src/wallet/MoneroWalletModel.cpp
@@ -382,6 +382,11 @@ namespace monero {
     return node;
   }
 
+  void MoneroOutputWallet::merge(const shared_ptr<MoneroOutputWallet>& self, const shared_ptr<MoneroOutputWallet>& other) {
+    cout << "MoneroOutputWallet::merge()" << endl;
+    throw runtime_error("not implemented");
+  }
+
   // ------------------------ MONERO OUTPUT REQUEST ---------------------------
 
   boost::property_tree::ptree MoneroOutputRequest::toPropertyTree() const {
diff --git a/src/wallet/MoneroWalletModel.h b/src/wallet/MoneroWalletModel.h
index c32d849..d71f65e 100644
--- a/src/wallet/MoneroWalletModel.h
+++ b/src/wallet/MoneroWalletModel.h
@@ -161,6 +161,7 @@ namespace monero {
     boost::optional<bool> isFrozen;
 
     boost::property_tree::ptree toPropertyTree() const;
+    void merge(const shared_ptr<MoneroOutputWallet>& self, const shared_ptr<MoneroOutputWallet>& other);
   };
 
   /**