diff --git a/src/qt/bitcoingui.h b/src/qt/bitcoingui.h
--- a/src/qt/bitcoingui.h
+++ b/src/qt/bitcoingui.h
@@ -73,7 +73,7 @@
     bool setCurrentWallet(const QString &name);
     void removeAllWallets();
 #endif // ENABLE_WALLET
-    bool enableWallet;
+    bool enableWallet = false;
 
 protected:
     void changeEvent(QEvent *e) override;
@@ -84,51 +84,51 @@
     bool eventFilter(QObject *object, QEvent *event) override;
 
 private:
-    ClientModel *clientModel;
-    WalletFrame *walletFrame;
-
-    UnitDisplayStatusBarControl *unitDisplayControl;
-    QLabel *labelWalletEncryptionIcon;
-    QLabel *labelWalletHDStatusIcon;
-    QLabel *connectionsControl;
-    QLabel *labelBlocksIcon;
-    QLabel *progressBarLabel;
-    QProgressBar *progressBar;
-    QProgressDialog *progressDialog;
-
-    QMenuBar *appMenuBar;
-    QAction *overviewAction;
-    QAction *historyAction;
-    QAction *quitAction;
-    QAction *sendCoinsAction;
-    QAction *sendCoinsMenuAction;
-    QAction *usedSendingAddressesAction;
-    QAction *usedReceivingAddressesAction;
-    QAction *signMessageAction;
-    QAction *verifyMessageAction;
-    QAction *aboutAction;
-    QAction *receiveCoinsAction;
-    QAction *receiveCoinsMenuAction;
-    QAction *optionsAction;
-    QAction *toggleHideAction;
-    QAction *encryptWalletAction;
-    QAction *backupWalletAction;
-    QAction *changePassphraseAction;
-    QAction *aboutQtAction;
-    QAction *openRPCConsoleAction;
-    QAction *openAction;
-    QAction *showHelpMessageAction;
-
-    QSystemTrayIcon *trayIcon;
-    QMenu *trayIconMenu;
-    Notificator *notificator;
-    RPCConsole *rpcConsole;
-    HelpMessageDialog *helpMessageDialog;
-    ModalOverlay *modalOverlay;
+    ClientModel *clientModel = nullptr;
+    WalletFrame *walletFrame = nullptr;
+
+    UnitDisplayStatusBarControl *unitDisplayControl = nullptr;
+    QLabel *labelWalletEncryptionIcon = nullptr;
+    QLabel *labelWalletHDStatusIcon = nullptr;
+    QLabel *connectionsControl = nullptr;
+    QLabel *labelBlocksIcon = nullptr;
+    QLabel *progressBarLabel = nullptr;
+    QProgressBar *progressBar = nullptr;
+    QProgressDialog *progressDialog = nullptr;
+
+    QMenuBar *appMenuBar = nullptr;
+    QAction *overviewAction = nullptr;
+    QAction *historyAction = nullptr;
+    QAction *quitAction = nullptr;
+    QAction *sendCoinsAction = nullptr;
+    QAction *sendCoinsMenuAction = nullptr;
+    QAction *usedSendingAddressesAction = nullptr;
+    QAction *usedReceivingAddressesAction = nullptr;
+    QAction *signMessageAction = nullptr;
+    QAction *verifyMessageAction = nullptr;
+    QAction *aboutAction = nullptr;
+    QAction *receiveCoinsAction = nullptr;
+    QAction *receiveCoinsMenuAction = nullptr;
+    QAction *optionsAction = nullptr;
+    QAction *toggleHideAction = nullptr;
+    QAction *encryptWalletAction = nullptr;
+    QAction *backupWalletAction = nullptr;
+    QAction *changePassphraseAction = nullptr;
+    QAction *aboutQtAction = nullptr;
+    QAction *openRPCConsoleAction = nullptr;
+    QAction *openAction = nullptr;
+    QAction *showHelpMessageAction = nullptr;
+
+    QSystemTrayIcon *trayIcon = nullptr;
+    QMenu *trayIconMenu = nullptr;
+    Notificator *notificator = nullptr;
+    RPCConsole *rpcConsole = nullptr;
+    HelpMessageDialog *helpMessageDialog = nullptr;
+    ModalOverlay *modalOverlay = nullptr;
 
     /** Keep track of previous number of blocks, to detect progress */
-    int prevBlocks;
-    int spinnerFrame;
+    int prevBlocks = 0;
+    int spinnerFrame = 0;
 
     const PlatformStyle *platformStyle;
     const Config *config;
diff --git a/src/qt/bitcoingui.cpp b/src/qt/bitcoingui.cpp
--- a/src/qt/bitcoingui.cpp
+++ b/src/qt/bitcoingui.cpp
@@ -77,20 +77,8 @@
 BitcoinGUI::BitcoinGUI(const Config *configIn,
                        const PlatformStyle *_platformStyle,
                        const NetworkStyle *networkStyle, QWidget *parent)
-    : QMainWindow(parent), enableWallet(false), clientModel(0), walletFrame(0),
-      unitDisplayControl(0), labelWalletEncryptionIcon(0),
-      labelWalletHDStatusIcon(0), connectionsControl(0), labelBlocksIcon(0),
-      progressBarLabel(0), progressBar(0), progressDialog(0), appMenuBar(0),
-      overviewAction(0), historyAction(0), quitAction(0), sendCoinsAction(0),
-      sendCoinsMenuAction(0), usedSendingAddressesAction(0),
-      usedReceivingAddressesAction(0), signMessageAction(0),
-      verifyMessageAction(0), aboutAction(0), receiveCoinsAction(0),
-      receiveCoinsMenuAction(0), optionsAction(0), toggleHideAction(0),
-      encryptWalletAction(0), backupWalletAction(0), changePassphraseAction(0),
-      aboutQtAction(0), openRPCConsoleAction(0), openAction(0),
-      showHelpMessageAction(0), trayIcon(0), trayIconMenu(0), notificator(0),
-      rpcConsole(0), helpMessageDialog(0), modalOverlay(0), prevBlocks(0),
-      spinnerFrame(0), platformStyle(_platformStyle), config(configIn) {
+    : QMainWindow(parent), enableWallet(false), platformStyle(_platformStyle),
+      config(configIn) {
     GUIUtil::restoreWindowGeometry("nWindow", QSize(850, 550), this);
 
     QString windowTitle = tr(PACKAGE_NAME) + " - ";