diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,6 +72,7 @@
    )
 
 add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x060000)
+add_definitions(-DQT_NO_FOREACH)
 
 add_subdirectory (src)
 if (BUILD_TESTING)
diff --git a/autotests/common/test.cpp b/autotests/common/test.cpp
--- a/autotests/common/test.cpp
+++ b/autotests/common/test.cpp
@@ -32,10 +32,10 @@
 
 bool Test::inEmptySession()
 {
-    QStringList services =
+    const QStringList services =
         QDBusConnection::sessionBus().interface()->registeredServiceNames();
 
-    foreach (const QString & service, services) {
+    for (const QString & service : services) {
         bool kdeServiceAndNotKAMD =
             service.startsWith(QStringLiteral("org.kde")) &&
             service != KAMD_DBUS_SERVICE;
diff --git a/src/imports/resourcemodel.cpp b/src/imports/resourcemodel.cpp
--- a/src/imports/resourcemodel.cpp
+++ b/src/imports/resourcemodel.cpp
@@ -617,7 +617,7 @@
 
     QStringList result;
 
-    foreach (const auto &resource, resources) {
+    for (const auto &resource : qAsConst(resources)) {
         result << resource.first;
     }
 
diff --git a/src/lib/activitiescache_p.cpp b/src/lib/activitiescache_p.cpp
--- a/src/lib/activitiescache_p.cpp
+++ b/src/lib/activitiescache_p.cpp
@@ -288,9 +288,9 @@
 
     m_activities.clear();
 
-    ActivityInfoList activities = _activities;
+    const ActivityInfoList activities = _activities;
 
-    foreach (const ActivityInfo &info, activities) {
+    for (const ActivityInfo &info : activities) {
         m_activities << info;
     }
 
diff --git a/src/lib/consumer.cpp b/src/lib/consumer.cpp
--- a/src/lib/consumer.cpp
+++ b/src/lib/consumer.cpp
@@ -75,7 +75,7 @@
 
     result.reserve(d->cache->m_activities.size());
 
-    foreach (const auto & info, d->cache->m_activities) {
+    for (const auto & info : qAsConst(d->cache->m_activities)) {
         if (info.state == state) {
             result << info.id;
         }
@@ -90,7 +90,7 @@
 
     result.reserve(d->cache->m_activities.size());
 
-    foreach (const auto & info, d->cache->m_activities) {
+    for (const auto & info : qAsConst(d->cache->m_activities)) {
         result << info.id;
     }
 
@@ -103,7 +103,7 @@
 
     result.reserve(d->cache->m_activities.size());
 
-    foreach (const auto & info, d->cache->m_activities) {
+    for (const auto & info : qAsConst(d->cache->m_activities)) {
         if (info.state == Info::Running || info.state == Info::Stopping) {
             result << info.id;
         }