diff --git a/src/plugins/android/androidconfigurations.cpp b/src/plugins/android/androidconfigurations.cpp
index 92507cd9be9..c281f25dda7 100644
--- a/src/plugins/android/androidconfigurations.cpp
+++ b/src/plugins/android/androidconfigurations.cpp
@@ -1228,13 +1228,12 @@ void AndroidConfigurations::load()
                                                               QSettings::NativeFormat));
             allVersions = settings->childGroups();
 #ifdef Q_OS_WIN
-#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
             if (allVersions.isEmpty()) {
                 settings.reset(new QSettings(jdkSettingsPath, QSettings::Registry64Format));
                 allVersions = settings->childGroups();
             }
-#endif
-#endif
+#endif // Q_OS_WIN
+
             QString javaHome;
             int major = -1;
             int minor = -1;
diff --git a/src/plugins/help/webenginehelpviewer.cpp b/src/plugins/help/webenginehelpviewer.cpp
index 18c4d865d41..08d5f44e600 100644
--- a/src/plugins/help/webenginehelpviewer.cpp
+++ b/src/plugins/help/webenginehelpviewer.cpp
@@ -36,9 +36,7 @@
 #include <QCoreApplication>
 #include <QTimer>
 #include <QVBoxLayout>
-#if QT_VERSION >= QT_VERSION_CHECK(5, 7, 0)
 #include <QWebEngineContextMenuData>
-#endif
 #include <QWebEngineHistory>
 #include <QWebEngineProfile>
 #include <QWebEngineSettings>
@@ -289,14 +287,6 @@ WebEngineHelpPage::WebEngineHelpPage(QObject *parent)
 {
 }
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
-QWebEnginePage *WebEngineHelpPage::createWindow(QWebEnginePage::WebWindowType)
-{
-    auto viewer = static_cast<WebEngineHelpViewer *>(OpenPagesManager::instance().createPage());
-    return viewer->page();
-}
-#endif
-
 WebView::WebView(WebEngineHelpViewer *viewer)
     : QWebEngineView(viewer),
       m_viewer(viewer)
@@ -314,12 +304,6 @@ void WebView::contextMenuEvent(QContextMenuEvent *event)
         // insert after
         ++it;
         QAction *before = (it == actions.cend() ? 0 : *it);
-#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
-        if (m_viewer->isActionVisible(HelpViewer::Action::NewPage)) {
-            QAction *openLinkInNewTab = page()->action(QWebEnginePage::OpenLinkInNewTab);
-            menu->insertAction(before, openLinkInNewTab);
-        }
-#else
         QUrl url = page()->contextMenuData().linkUrl();
         if (m_viewer->isActionVisible(HelpViewer::Action::NewPage)) {
             auto openLink = new QAction(QCoreApplication::translate("HelpViewer",
@@ -337,7 +321,6 @@ void WebView::contextMenuEvent(QContextMenuEvent *event)
             });
             menu->insertAction(before, openLink);
         }
-#endif
     }
 
     connect(menu, &QMenu::aboutToHide, menu, &QObject::deleteLater);
diff --git a/src/plugins/help/webenginehelpviewer.h b/src/plugins/help/webenginehelpviewer.h
index e060c8d7188..cffe26af219 100644
--- a/src/plugins/help/webenginehelpviewer.h
+++ b/src/plugins/help/webenginehelpviewer.h
@@ -46,9 +46,6 @@ class WebEngineHelpPage : public QWebEnginePage
 {
 public:
     explicit WebEngineHelpPage(QObject *parent = nullptr);
-#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
-    QWebEnginePage *createWindow(QWebEnginePage::WebWindowType) override;
-#endif
 };
 
 class WebView : public QWebEngineView
diff --git a/src/plugins/qmlprofiler/qmlprofilertraceview.cpp b/src/plugins/qmlprofiler/qmlprofilertraceview.cpp
index 3eb963d95ff..d654869f200 100644
--- a/src/plugins/qmlprofiler/qmlprofilertraceview.cpp
+++ b/src/plugins/qmlprofiler/qmlprofilertraceview.cpp
@@ -295,12 +295,8 @@ void QmlProfilerTraceView::showContextMenu(QPoint position)
 
 bool QmlProfilerTraceView::isUsable() const
 {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 8, 0))
     return d->m_mainView->quickWindow()->rendererInterface()->graphicsApi()
             == QSGRendererInterface::OpenGL;
-#else
-    return true;
-#endif
 }
 
 bool QmlProfilerTraceView::isSuspended() const
diff --git a/src/plugins/serialterminal/serialcontrol.cpp b/src/plugins/serialterminal/serialcontrol.cpp
index 28d86a597e8..e3ca879a0ce 100644
--- a/src/plugins/serialterminal/serialcontrol.cpp
+++ b/src/plugins/serialterminal/serialcontrol.cpp
@@ -52,15 +52,8 @@ SerialControl::SerialControl(const Settings &settings, QObject *parent) :
 
     connect(&m_serialPort, &QSerialPort::readyRead,
             this, &SerialControl::handleReadyRead);
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 8, 0))
     connect(&m_serialPort, &QSerialPort::errorOccurred,
             this, &SerialControl::handleError);
-#else
-    connect(&m_serialPort,
-            static_cast<void (QSerialPort::*)(QSerialPort::SerialPortError)>(&QSerialPort::error),
-            this, &SerialControl::handleError);
-#endif
-
     connect(&m_reconnectTimer, &QTimer::timeout,
             this, &SerialControl::reconnectTimeout);
 }