diff --git a/autotests/test_builtin_effectloader.cpp b/autotests/test_builtin_effectloader.cpp
--- a/autotests/test_builtin_effectloader.cpp
+++ b/autotests/test_builtin_effectloader.cpp
@@ -176,7 +176,7 @@
     KWin::BuiltInEffectLoader loader;
     QStringList result = loader.listOfKnownEffects();
     QCOMPARE(result.size(), expectedEffects.size());
-    qSort(result);
+    std::sort(result.begin(), result.end());
     for (int i = 0; i < expectedEffects.size(); ++i) {
         QCOMPARE(result.at(i), expectedEffects.at(i));
     }
@@ -557,7 +557,7 @@
         QCOMPARE(list.size(), 2);
         loadedEffects << list.at(1).toString();
     }
-    qSort(loadedEffects);
+    std::sort(loadedEffects.begin(), loadedEffects.end());
     QCOMPARE(loadedEffects.at(0), QStringLiteral("kscreen"));
     QCOMPARE(loadedEffects.at(1), QStringLiteral("mouseclick"));
 }
diff --git a/autotests/test_scripted_effectloader.cpp b/autotests/test_scripted_effectloader.cpp
--- a/autotests/test_scripted_effectloader.cpp
+++ b/autotests/test_scripted_effectloader.cpp
@@ -437,7 +437,7 @@
         QCOMPARE(list.size(), 2);
         loadedEffects << list.at(1).toString();
     }
-    qSort(loadedEffects);
+    std::sort(loadedEffects.begin(), loadedEffects.end());
     QCOMPARE(loadedEffects.at(0), kwin4 + QStringLiteral("eyeonscreen"));
     QCOMPARE(loadedEffects.at(1), kwin4 + QStringLiteral("fade"));
 }
diff --git a/effects/presentwindows/presentwindows.cpp b/effects/presentwindows/presentwindows.cpp
--- a/effects/presentwindows/presentwindows.cpp
+++ b/effects/presentwindows/presentwindows.cpp
@@ -1133,7 +1133,7 @@
     QRect availRect = effects->clientArea(ScreenArea, screen, effects->currentDesktop());
     if (m_showPanel)   // reserve space for the panel
         availRect = effects->clientArea(MaximizeArea, screen, effects->currentDesktop());
-    qSort(windowlist);   // The location of the windows should not depend on the stacking order
+    std::sort(windowlist.begin(), windowlist.end());   // The location of the windows should not depend on the stacking order
 
     // Following code is taken from Kompose 0.5.4, src/komposelayout.cpp
 
@@ -1280,7 +1280,7 @@
 
     // As we are using pseudo-random movement (See "slot") we need to make sure the list
     // is always sorted the same way no matter which window is currently active.
-    qSort(windowlist);
+    std::sort(windowlist.begin(), windowlist.end());
 
     QRect area = effects->clientArea(ScreenArea, screen, effects->currentDesktop());
     if (m_showPanel)   // reserve space for the panel
diff --git a/kcmkwin/common/effectsmodel.cpp b/kcmkwin/common/effectsmodel.cpp
--- a/kcmkwin/common/effectsmodel.cpp
+++ b/kcmkwin/common/effectsmodel.cpp
@@ -397,7 +397,7 @@
     loadJavascriptEffects(kwinConfig);
     loadPluginEffects(kwinConfig, configs);
 
-    qSort(m_pendingEffects.begin(), m_pendingEffects.end(),
+    std::sort(m_pendingEffects.begin(), m_pendingEffects.end(),
         [](const EffectData &a, const EffectData &b) {
             if (a.category == b.category) {
                 if (a.exclusiveGroup == b.exclusiveGroup) {
diff --git a/kcmkwin/kwincompositing/compositing.cpp b/kcmkwin/kwincompositing/compositing.cpp
--- a/kcmkwin/kwincompositing/compositing.cpp
+++ b/kcmkwin/kwincompositing/compositing.cpp
@@ -389,7 +389,7 @@
         it++;
     }
 
-    qSort(m_compositingList.begin(), m_compositingList.end(), [](const CompositingData &a, const CompositingData &b) {
+    std::sort(m_compositingList.begin(), m_compositingList.end(), [](const CompositingData &a, const CompositingData &b) {
             return a.type < b.type;
     });
     endResetModel();