diff --git a/libdbusmenuqt/dbusmenuimporter.cpp b/libdbusmenuqt/dbusmenuimporter.cpp
index 1473b2d5f..1173692aa 100644
--- a/libdbusmenuqt/dbusmenuimporter.cpp
+++ b/libdbusmenuqt/dbusmenuimporter.cpp
@@ -148,7 +148,7 @@ public:
      */
     void updateAction(QAction *action, const QVariantMap &map, const QStringList &requestedProperties)
     {
-        Q_FOREACH (const QString &key, requestedProperties) {
+        for (const QString &key : requestedProperties) {
             updateActionProperty(action, key, map.value(key));
         }
     }
@@ -308,9 +308,9 @@ void DBusMenuImporter::slotLayoutUpdated(uint revision, int parentId)
 
 void DBusMenuImporter::processPendingLayoutUpdates()
 {
-    QSet<int> ids = d->m_pendingLayoutUpdates;
+    const QSet<int> ids = d->m_pendingLayoutUpdates;
     d->m_pendingLayoutUpdates.clear();
-    Q_FOREACH (int id, ids) {
+    for (int id : ids) {
         d->refresh(id);
     }
 }
@@ -325,7 +325,7 @@ QMenu *DBusMenuImporter::menu() const
 
 void DBusMenuImporterPrivate::slotItemsPropertiesUpdated(const DBusMenuItemList &updatedList, const DBusMenuItemKeysList &removedList)
 {
-    Q_FOREACH (const DBusMenuItem &item, updatedList) {
+    for (const DBusMenuItem &item : updatedList) {
         QAction *action = m_actionForId.value(item.id);
         if (!action) {
             // We don't know this action. It probably is in a menu we haven't fetched yet.
@@ -338,14 +338,15 @@ void DBusMenuImporterPrivate::slotItemsPropertiesUpdated(const DBusMenuItemList
         }
     }
 
-    Q_FOREACH (const DBusMenuItemKeys &item, removedList) {
+    for (const DBusMenuItemKeys &item : removedList) {
         QAction *action = m_actionForId.value(item.id);
         if (!action) {
             // We don't know this action. It probably is in a menu we haven't fetched yet.
             continue;
         }
 
-        Q_FOREACH (const QString &key, item.properties) {
+        const auto properties{item.properties};
+        for (const QString &key : properties) {
             updateActionProperty(action, key, QVariant());
         }
     }
@@ -435,9 +436,9 @@ void DBusMenuImporter::slotGetLayoutFinished(QDBusPendingCallWatcher *watcher)
         } else {
             action = *it;
             QStringList filteredKeys = dbusMenuItem.properties.keys();
-            filteredKeys.removeOne("type");
-            filteredKeys.removeOne("toggle-type");
-            filteredKeys.removeOne("children-display");
+            filteredKeys.removeOne(QStringLiteral("type"));
+            filteredKeys.removeOne(QStringLiteral("toggle-type"));
+            filteredKeys.removeOne(QStringLiteral("children-display"));
             d->updateAction(*it, dbusMenuItem.properties, filteredKeys);
             // Move the action to the tail so we can keep the order same as the dbus request.
             menu->removeAction(action);
diff --git a/libkworkspace/kworkspace.cpp b/libkworkspace/kworkspace.cpp
index 8dd295e81..7be6b6309 100644
--- a/libkworkspace/kworkspace.cpp
+++ b/libkworkspace/kworkspace.cpp
@@ -85,9 +85,9 @@ void propagateSessionManager()
     // strip the screen number from the display
     display.remove(QRegularExpression(QStringLiteral("\\.\\d+$")));
     int i;
-    while ((i = display.indexOf(':')) >= 0)
+    while ((i = display.indexOf(QLatin1Char(':'))) >= 0)
         display[i] = '_';
-    while ((i = display.indexOf('/')) >= 0)
+    while ((i = display.indexOf(QLatin1Char('/'))) >= 0)
         display[i] = '_';
 
     fName += '_';
diff --git a/libkworkspace/sessionmanagementbackend.cpp b/libkworkspace/sessionmanagementbackend.cpp
index f79c0a332..675489709 100644
--- a/libkworkspace/sessionmanagementbackend.cpp
+++ b/libkworkspace/sessionmanagementbackend.cpp
@@ -45,7 +45,7 @@ SessionBackend *SessionBackend::self()
 
 SessionBackend::SessionBackend()
 {
-    m_kserverConfig = KConfigWatcher::create(KSharedConfig::openConfig("ksmserverrc"));
+    m_kserverConfig = KConfigWatcher::create(KSharedConfig::openConfig(QStringLiteral("ksmserverrc")));
 }
 
 bool SessionBackend::confirmLogout() const
diff --git a/libkworkspace/updatelaunchenvjob.cpp b/libkworkspace/updatelaunchenvjob.cpp
index 9667d4f07..d072a4777 100644
--- a/libkworkspace/updatelaunchenvjob.cpp
+++ b/libkworkspace/updatelaunchenvjob.cpp
@@ -130,11 +130,11 @@ bool UpdateLaunchEnvJob::Private::isPosixName(const QString &name)
     // Ensure systemd compat by only allowing alphanumerics and _ in names.
     bool first = true;
     for (const QChar c : name) {
-        if (first && !c.isLetter() && c != QChar('_')) {
+        if (first && !c.isLetter() && c != QLatin1Char('_')) {
             return false;
         } else if (first) {
             first = false;
-        } else if (!c.isLetterOrNumber() && c != QChar('_')) {
+        } else if (!c.isLetterOrNumber() && c != QLatin1Char('_')) {
             return false;
         }
     }
diff --git a/libtaskmanager/waylandtasksmodel.cpp b/libtaskmanager/waylandtasksmodel.cpp
index 54dcd235e..fd026e4d8 100644
--- a/libtaskmanager/waylandtasksmodel.cpp
+++ b/libtaskmanager/waylandtasksmodel.cpp
@@ -90,7 +90,7 @@ void WaylandTasksModel::Private::init()
     rulesConfig = KSharedConfig::openConfig(QStringLiteral("taskmanagerrulesrc"));
     configWatcher = new KDirWatch(q);
 
-    foreach (const QString &location, QStandardPaths::standardLocations(QStandardPaths::ConfigLocation)) {
+    for (const QString &location : QStandardPaths::standardLocations(QStandardPaths::ConfigLocation)) {
         configWatcher->addFile(location + QLatin1String("/taskmanagerrulesrc"));
     }