diff --git a/src/qt/coincontroldialog.cpp b/src/qt/coincontroldialog.cpp
index cb888a07c4f..778dbcb1ca3 100644
--- a/src/qt/coincontroldialog.cpp
+++ b/src/qt/coincontroldialog.cpp
@@ -30,7 +30,6 @@
 #include <QTreeWidget>
 #include <QTreeWidgetItem>
 
-using namespace std;
 QList<CAmount> CoinControlDialog::payAmounts;
 CCoinControl* CoinControlDialog::coinControl = new CCoinControl();
 bool CoinControlDialog::fSubtractFeeFromAmount = false;
@@ -442,7 +441,7 @@ QString CoinControlDialog::getPriorityLabel(double dPriority, double mempoolEsti
 // shows count of locked unspent outputs
 void CoinControlDialog::updateLabelLocked()
 {
-    vector<COutPoint> vOutpts;
+    std::vector<COutPoint> vOutpts;
     model->listLockedCoins(vOutpts);
     if (vOutpts.size() > 0)
     {
@@ -467,7 +466,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
 
         if (amount > 0)
         {
-            CTxOut txout(amount, (CScript)vector<unsigned char>(24, 0));
+            CTxOut txout(amount, (CScript)std::vector<unsigned char>(24, 0));
             txDummy.vout.push_back(txout);
             if (txout.IsDust(::minRelayTxFee))
                fDust = true;
@@ -487,8 +486,8 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
     int nQuantityUncompressed   = 0;
     bool fAllowFree             = false;
 
-    vector<COutPoint> vCoinControl;
-    vector<COutput>   vOutputs;
+    std::vector<COutPoint> vCoinControl;
+    std::vector<COutput>   vOutputs;
     coinControl->ListSelected(vCoinControl);
     model->getOutputs(vCoinControl, vOutputs);
 
@@ -568,7 +567,7 @@ void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
             // Never create dust outputs; if we would, just add the dust to the fee.
             if (nChange > 0 && nChange < CENT)
             {
-                CTxOut txout(nChange, (CScript)vector<unsigned char>(24, 0));
+                CTxOut txout(nChange, (CScript)std::vector<unsigned char>(24, 0));
                 if (txout.IsDust(::minRelayTxFee))
                 {
                     if (CoinControlDialog::fSubtractFeeFromAmount) // dust-change will be raised until no dust
@@ -687,10 +686,10 @@ void CoinControlDialog::updateView()
     int nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
     double mempoolEstimatePriority = mempool.estimatePriority(nTxConfirmTarget);
 
-    map<QString, vector<COutput> > mapCoins;
+    std::map<QString, std::vector<COutput> > mapCoins;
     model->listCoins(mapCoins);
 
-    BOOST_FOREACH(const PAIRTYPE(QString, vector<COutput>)& coins, mapCoins) {
+    BOOST_FOREACH(const PAIRTYPE(QString, std::vector<COutput>)& coins, mapCoins) {
         QTreeWidgetItem *itemWalletAddress = new QTreeWidgetItem();
         itemWalletAddress->setCheckState(COLUMN_CHECKBOX, Qt::Unchecked);
         QString sWalletAddress = coins.first;
diff --git a/src/qt/paymentrequestplus.cpp b/src/qt/paymentrequestplus.cpp
index 7e9729eeb9c..78a783dea46 100644
--- a/src/qt/paymentrequestplus.cpp
+++ b/src/qt/paymentrequestplus.cpp
@@ -19,8 +19,6 @@
 #include <QDebug>
 #include <QSslCertificate>
 
-using namespace std;
-
 class SSLVerifyError : public std::runtime_error
 {
 public:
@@ -49,7 +47,7 @@ bool PaymentRequestPlus::parse(const QByteArray& data)
     return true;
 }
 
-bool PaymentRequestPlus::SerializeToString(string* output) const
+bool PaymentRequestPlus::SerializeToString(std::string* output) const
 {
     return paymentRequest.SerializeToString(output);
 }
diff --git a/src/qt/paymentserver.cpp b/src/qt/paymentserver.cpp
index 654292903b6..6481b0046e7 100644
--- a/src/qt/paymentserver.cpp
+++ b/src/qt/paymentserver.cpp
@@ -46,8 +46,6 @@
 #include <QUrlQuery>
 #endif
 
-using namespace std;
-
 const int BITCOIN_IPC_CONNECT_TIMEOUT = 1000; // milliseconds
 const QString BITCOIN_IPC_PREFIX("bitcoin:");
 // BIP70 payment protocol messages
@@ -647,7 +645,7 @@ void PaymentServer::fetchPaymentACK(CWallet* wallet, SendCoinsRecipient recipien
     // Create a new refund address, or re-use:
     QString account = tr("Refund from %1").arg(recipient.authenticatedMerchant);
     std::string strAccount = account.toStdString();
-    set<CTxDestination> refundAddresses = wallet->GetAccountAddresses(strAccount);
+    std::set<CTxDestination> refundAddresses = wallet->GetAccountAddresses(strAccount);
     if (!refundAddresses.empty()) {
         CScript s = GetScriptForDestination(*refundAddresses.begin());
         payments::Output* refund_to = payment.add_refund_to();
diff --git a/src/qt/transactiondesc.cpp b/src/qt/transactiondesc.cpp
index d7ee3d4c78f..af78a51d0fc 100644
--- a/src/qt/transactiondesc.cpp
+++ b/src/qt/transactiondesc.cpp
@@ -21,8 +21,6 @@
 #include <stdint.h>
 #include <string>
 
-using namespace std;
-
 QString TransactionDesc::FormatTxStatus(const CWalletTx& wtx)
 {
     AssertLockHeld(cs_main);
@@ -243,14 +241,14 @@ QString TransactionDesc::toHTML(CWallet *wallet, CWalletTx &wtx, TransactionReco
     strHTML += "<b>" + tr("Transaction ID") + ":</b> " + TransactionRecord::formatSubTxId(wtx.GetHash(), rec->idx) + "<br>";
 
     // Message from normal bitcoin:URI (bitcoin:123...?message=example)
-    Q_FOREACH (const PAIRTYPE(string, string)& r, wtx.vOrderForm)
+    Q_FOREACH (const PAIRTYPE(std::string, std::string)& r, wtx.vOrderForm)
         if (r.first == "Message")
             strHTML += "<br><b>" + tr("Message") + ":</b><br>" + GUIUtil::HtmlEscape(r.second, true) + "<br>";
 
     //
     // PaymentRequest info:
     //
-    Q_FOREACH (const PAIRTYPE(string, string)& r, wtx.vOrderForm)
+    Q_FOREACH (const PAIRTYPE(std::string, std::string)& r, wtx.vOrderForm)
     {
         if (r.first == "PaymentRequest")
         {
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 2691fa93099..168a0255ffd 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -25,8 +25,6 @@
 #include <QSet>
 #include <QTimer>
 
-using namespace std;
-
 WalletModel::WalletModel(CWallet *wallet, OptionsModel *optionsModel, QObject *parent) :
     QObject(parent), wallet(wallet), optionsModel(optionsModel), addressTableModel(0),
     transactionTableModel(0),