diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
index 346128c0c4..2c47f30e92 100644
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -82,14 +82,14 @@ static void InitMessage(const std::string &message)
     if(splashref)
     {
         splashref->showMessage(QString::fromStdString(message), Qt::AlignBottom|Qt::AlignHCenter, QColor(255,255,200));
-        QApplication::instance()->processEvents();
+        qApp->processEvents();
     }
     printf("init message: %s\n", message.c_str());
 }
 
 static void QueueShutdown()
 {
-    QMetaObject::invokeMethod(QCoreApplication::instance(), "quit", Qt::QueuedConnection);
+    QMetaObject::invokeMethod(qApp, "quit", Qt::QueuedConnection);
 }
 
 /*
diff --git a/src/qt/bitcoinamountfield.cpp b/src/qt/bitcoinamountfield.cpp
index 4fa2ca508b..b12e296f99 100644
--- a/src/qt/bitcoinamountfield.cpp
+++ b/src/qt/bitcoinamountfield.cpp
@@ -98,7 +98,7 @@ bool BitcoinAmountField::eventFilter(QObject *object, QEvent *event)
         {
             // Translate a comma into a period
             QKeyEvent periodKeyEvent(event->type(), Qt::Key_Period, keyEvent->modifiers(), ".", keyEvent->isAutoRepeat(), keyEvent->count());
-            qApp->sendEvent(object, &periodKeyEvent);
+            QApplication::sendEvent(object, &periodKeyEvent);
             return true;
         }
     }
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
index 1c9094a88c..11dce3ced7 100644
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -70,7 +70,7 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
     restoreWindowGeometry();
     setWindowTitle(tr("Bitcoin") + " - " + tr("Wallet"));
 #ifndef Q_OS_MAC
-    qApp->setWindowIcon(QIcon(":icons/bitcoin"));
+    QApplication::setWindowIcon(QIcon(":icons/bitcoin"));
     setWindowIcon(QIcon(":icons/bitcoin"));
 #else
     setUnifiedTitleAndToolBarOnMac(true);
@@ -127,7 +127,7 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
     // Override style sheet for progress bar for styles that have a segmented progress bar,
     // as they make the text unreadable (workaround for issue #1071)
     // See https://qt-project.org/doc/qt-4.8/gallery.html
-    QString curStyle = qApp->style()->metaObject()->className();
+    QString curStyle = QApplication::style()->metaObject()->className();
     if(curStyle == "QWindowsStyle" || curStyle == "QWindowsXPStyle")
     {
         progressBar->setStyleSheet("QProgressBar { background-color: #e8e8e8; border: 1px solid grey; border-radius: 7px; padding: 1px; text-align: center; } QProgressBar::chunk { background: QLinearGradient(x1: 0, y1: 0, x2: 1, y2: 0, stop: 0 #FF8000, stop: 1 orange); border-radius: 7px; margin: 0px; }");
@@ -308,7 +308,7 @@ void BitcoinGUI::setClientModel(ClientModel *clientModel)
         {
             setWindowTitle(windowTitle() + QString(" ") + tr("[testnet]"));
 #ifndef Q_OS_MAC
-            qApp->setWindowIcon(QIcon(":icons/bitcoin_testnet"));
+            QApplication::setWindowIcon(QIcon(":icons/bitcoin_testnet"));
             setWindowIcon(QIcon(":icons/bitcoin_testnet"));
 #else
             MacDockIconHandler::instance()->setIcon(QIcon(":icons/bitcoin_testnet"));
@@ -368,7 +368,7 @@ void BitcoinGUI::createTrayIcon()
     trayIcon->show();
 #endif
 
-    notificator = new Notificator(qApp->applicationName(), trayIcon);
+    notificator = new Notificator(QApplication::applicationName(), trayIcon);
 }
 
 void BitcoinGUI::createTrayIconMenu()
@@ -432,7 +432,7 @@ void BitcoinGUI::restoreWindowGeometry()
     QSize size = settings.value("nWindowSize", QSize(850, 550)).toSize();
     if (!pos.x() && !pos.y())
     {
-        QRect screen = qApp->desktop()->screenGeometry();
+        QRect screen = QApplication::desktop()->screenGeometry();
         pos.setX((screen.width()-size.width())/2);
         pos.setY((screen.height()-size.height())/2);
     }
@@ -681,7 +681,7 @@ void BitcoinGUI::closeEvent(QCloseEvent *event)
         if(!clientModel->getOptionsModel()->getMinimizeToTray() &&
            !clientModel->getOptionsModel()->getMinimizeOnClose())
         {
-            qApp->quit();
+            QApplication::quit();
         }
 #endif
     }
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
index e56e40c20e..2105f0730e 100644
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -161,9 +161,9 @@ void copyEntryData(QAbstractItemView *view, int column, int role)
     if(!selection.isEmpty())
     {
         // Copy first item (global clipboard)
-        qApp->clipboard()->setText(selection.at(0).data(role).toString(), QClipboard::Clipboard);
+        QApplication::clipboard()->setText(selection.at(0).data(role).toString(), QClipboard::Clipboard);
         // Copy first item (global mouse selection for e.g. X11 - NOP on Windows)
-        qApp->clipboard()->setText(selection.at(0).data(role).toString(), QClipboard::Selection);
+        QApplication::clipboard()->setText(selection.at(0).data(role).toString(), QClipboard::Selection);
     }
 }
 
@@ -227,7 +227,7 @@ Qt::ConnectionType blockingGUIThreadConnection()
 
 bool checkPoint(const QPoint &p, const QWidget *w)
 {
-    QWidget *atW = qApp->widgetAt(w->mapToGlobal(p));
+    QWidget *atW = QApplication::widgetAt(w->mapToGlobal(p));
     if (!atW) return false;
     return atW->topLevelWidget() == w;
 }
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 2133a5e729..eb3ce48a6e 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -202,7 +202,7 @@ SendCoinsEntry *SendCoinsDialog::addEntry()
     entry->clear();
     entry->setFocus();
     ui->scrollAreaWidgetContents->resize(ui->scrollAreaWidgetContents->sizeHint());
-    QCoreApplication::instance()->processEvents();
+    qApp->processEvents();
     QScrollBar* bar = ui->scrollArea->verticalScrollBar();
     if(bar)
         bar->setSliderPosition(bar->maximum());