diff --git a/src/corelib/global/qflags.h b/src/corelib/global/qflags.h
index e576128bce..ded933880e 100644
--- a/src/corelib/global/qflags.h
+++ b/src/corelib/global/qflags.h
@@ -93,10 +93,6 @@ class QFlags
                       "long long will overflow.");
     static_assert((std::is_enum<Enum>::value), "QFlags is only usable on enumeration types.");
 
-#if QT_DEPRECATED_SINCE(5,15)
-    struct Private;
-    typedef int (Private::*Zero);
-#endif
 public:
 #if defined(Q_CC_MSVC) || defined(Q_CLANG_QDOC)
     // see above for MSVC
@@ -117,9 +113,6 @@ public:
 #endif
     constexpr inline QFlags() noexcept : i(0) {}
     constexpr inline QFlags(Enum flags) noexcept : i(Int(flags)) {}
-#if QT_DEPRECATED_SINCE(5,15)
-    QT_DEPRECATED_X("Use default constructor instead") constexpr inline QFlags(Zero) noexcept : i(0) {}
-#endif
     constexpr inline QFlags(QFlag flag) noexcept : i(flag) {}
 
     constexpr inline QFlags(std::initializer_list<Enum> flags) noexcept
diff --git a/src/plugins/platforms/ios/qiosinputcontext.h b/src/plugins/platforms/ios/qiosinputcontext.h
index debdf7a638..c59c5328af 100644
--- a/src/plugins/platforms/ios/qiosinputcontext.h
+++ b/src/plugins/platforms/ios/qiosinputcontext.h
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2020 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the plugins of the Qt Toolkit.
@@ -76,10 +76,10 @@ struct KeyboardState
 
 struct ImeState
 {
-    ImeState() : currentState(0), focusObject(0) {}
+    ImeState() = default;
     Qt::InputMethodQueries update(Qt::InputMethodQueries properties);
-    QInputMethodQueryEvent currentState;
-    QObject *focusObject;
+    QInputMethodQueryEvent currentState = QInputMethodQueryEvent({});
+    QObject *focusObject = nullptr;
 };
 
 class QIOSInputContext : public QPlatformInputContext
diff --git a/src/plugins/platforms/ios/qiosinputcontext.mm b/src/plugins/platforms/ios/qiosinputcontext.mm
index d2229df133..0eb12498b4 100644
--- a/src/plugins/platforms/ios/qiosinputcontext.mm
+++ b/src/plugins/platforms/ios/qiosinputcontext.mm
@@ -1,6 +1,6 @@
 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2020 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the plugins of the Qt Toolkit.
@@ -297,7 +297,7 @@ QT_BEGIN_NAMESPACE
 Qt::InputMethodQueries ImeState::update(Qt::InputMethodQueries properties)
 {
     if (!properties)
-        return 0;
+        return {};
 
     QInputMethodQueryEvent newState(properties);
 
diff --git a/tests/auto/widgets/dialogs/qfiledialog2/tst_qfiledialog2.cpp b/tests/auto/widgets/dialogs/qfiledialog2/tst_qfiledialog2.cpp
index beec8db0d9..45ed5d7d21 100644
--- a/tests/auto/widgets/dialogs/qfiledialog2/tst_qfiledialog2.cpp
+++ b/tests/auto/widgets/dialogs/qfiledialog2/tst_qfiledialog2.cpp
@@ -638,7 +638,7 @@ void tst_QFileDialog2::task226366_lowerCaseHardDriveWindows()
     QLineEdit *edit = fd.findChild<QLineEdit*>("fileNameEdit");
     QToolButton *buttonParent = fd.findChild<QToolButton*>("toParentButton");
     QTest::qWait(200);
-    QTest::mouseClick(buttonParent, Qt::LeftButton,0,QPoint(0,0));
+    QTest::mouseClick(buttonParent, Qt::LeftButton, {}, QPoint(0, 0));
     QTest::qWait(2000);
     QTest::keyClick(edit, Qt::Key_C);
     QTest::qWait(200);
diff --git a/tests/auto/widgets/widgets/qmenu/tst_qmenu.cpp b/tests/auto/widgets/widgets/qmenu/tst_qmenu.cpp
index 35611d470d..9a6cf3bfcf 100644
--- a/tests/auto/widgets/widgets/qmenu/tst_qmenu.cpp
+++ b/tests/auto/widgets/widgets/qmenu/tst_qmenu.cpp
@@ -339,14 +339,14 @@ void tst_QMenu::mouseActivation()
     menubar.show();
 
 
-    QTest::mouseClick(&menubar, Qt::LeftButton, 0, menubar.actionGeometry(action).center(), 300);
+    QTest::mouseClick(&menubar, Qt::LeftButton, {}, menubar.actionGeometry(action).center(), 300);
     QVERIFY(submenu.isVisible());
-    QTest::mouseClick(&submenu, Qt::LeftButton, 0, QPoint(5, 5), 300);
+    QTest::mouseClick(&submenu, Qt::LeftButton, {}, QPoint(5, 5), 300);
     QVERIFY(!submenu.isVisible());
 
-    QTest::mouseClick(&menubar, Qt::LeftButton, 0, menubar.actionGeometry(action).center(), 300);
+    QTest::mouseClick(&menubar, Qt::LeftButton, {}, menubar.actionGeometry(action).center(), 300);
     QVERIFY(submenu.isVisible());
-    QTest::mouseClick(&submenu, Qt::RightButton, 0, QPoint(5, 5), 300);
+    QTest::mouseClick(&submenu, Qt::RightButton, {}, QPoint(5, 5), 300);
     QVERIFY(submenu.isVisible());
 #endif
 }