diff --git a/lib/contextmanager.cpp b/lib/contextmanager.cpp
--- a/lib/contextmanager.cpp
+++ b/lib/contextmanager.cpp
@@ -119,7 +119,7 @@
     connect(d->mDirModel->dirLister(), SIGNAL(redirection(QUrl)),
             SLOT(slotDirListerRedirection(QUrl)));
 
-    connect(d->mDirModel->dirLister(), static_cast<void (KDirLister::*)()>(&KDirLister::completed), this, &ContextManager::slotDirListerCompleted);
+    connect(d->mDirModel->dirLister(), QOverload<>::of(&KDirLister::completed), this, &ContextManager::slotDirListerCompleted);
 
     d->mSelectionModel = new QItemSelectionModel(d->mDirModel);
 
diff --git a/lib/crop/cropwidget.cpp b/lib/crop/cropwidget.cpp
--- a/lib/crop/cropwidget.cpp
+++ b/lib/crop/cropwidget.cpp
@@ -283,19 +283,19 @@
 
     connect(d->mCropTool, &CropTool::rectUpdated, this, &CropWidget::setCropRect);
 
-    connect(d->leftSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &CropWidget::slotPositionChanged);
-    connect(d->topSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &CropWidget::slotPositionChanged);
-    connect(d->widthSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &CropWidget::slotWidthChanged);
-    connect(d->heightSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &CropWidget::slotHeightChanged);
+    connect(d->leftSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &CropWidget::slotPositionChanged);
+    connect(d->topSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &CropWidget::slotPositionChanged);
+    connect(d->widthSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &CropWidget::slotWidthChanged);
+    connect(d->heightSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &CropWidget::slotHeightChanged);
 
     d->initDialogButtonBox();
 
     // We need to listen for both signals because the combobox is multi-function:
     // Text Changed: required so that manual ratio entry is detected (index doesn't change)
     // Index Changed: required so that choosing an item with the same text is detected (e.g. going from US Letter portrait
     // to US Letter landscape)
     connect(d->ratioComboBox, &QComboBox::editTextChanged, this, &CropWidget::slotRatioComboBoxChanged);
-    connect(d->ratioComboBox, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this, &CropWidget::slotRatioComboBoxChanged);
+    connect(d->ratioComboBox, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &CropWidget::slotRatioComboBoxChanged);
 
     // Don't do this before signals are connected, otherwise the tool won't get
     // initialized
diff --git a/lib/invisiblebuttongroup.cpp b/lib/invisiblebuttongroup.cpp
--- a/lib/invisiblebuttongroup.cpp
+++ b/lib/invisiblebuttongroup.cpp
@@ -45,7 +45,7 @@
     hide();
     d->mGroup = new QButtonGroup(this);
     d->mGroup->setExclusive(true);
-    connect(d->mGroup, static_cast<void (QButtonGroup::*)(int)>(&QButtonGroup::buttonClicked), this, &InvisibleButtonGroup::selectionChanged);
+    connect(d->mGroup, QOverload<int>::of(&QButtonGroup::buttonClicked), this, &InvisibleButtonGroup::selectionChanged);
     const QString name = QString::fromLatin1(metaObject()->className());
     if (!KConfigDialogManager::propertyMap()->contains(name)) {
         KConfigDialogManager::propertyMap()->insert(name, "current");
diff --git a/lib/recursivedirmodel.cpp b/lib/recursivedirmodel.cpp
--- a/lib/recursivedirmodel.cpp
+++ b/lib/recursivedirmodel.cpp
@@ -87,9 +87,9 @@
     d->mDirLister = new KDirLister(this);
     connect(d->mDirLister, &KDirLister::itemsAdded, this, &RecursiveDirModel::slotItemsAdded);
     connect(d->mDirLister, &KDirLister::itemsDeleted, this, &RecursiveDirModel::slotItemsDeleted);
-    connect(d->mDirLister, static_cast<void (KDirLister::*)()>(&KDirLister::completed), this, &RecursiveDirModel::completed);
-    connect(d->mDirLister, static_cast<void (KDirLister::*)()>(&KDirLister::clear), this, &RecursiveDirModel::slotCleared);
-    connect(d->mDirLister, static_cast<void (KDirLister::*)(const QUrl &)>(&KDirLister::clear), this, &RecursiveDirModel::slotDirCleared);
+    connect(d->mDirLister, QOverload<>::of(&KDirLister::completed), this, &RecursiveDirModel::completed);
+    connect(d->mDirLister, QOverload<>::of(&KDirLister::clear), this, &RecursiveDirModel::slotCleared);
+    connect(d->mDirLister, QOverload<const QUrl &>::of(&KDirLister::clear), this, &RecursiveDirModel::slotDirCleared);
 }
 
 RecursiveDirModel::~RecursiveDirModel()
diff --git a/lib/resize/resizeimagedialog.cpp b/lib/resize/resizeimagedialog.cpp
--- a/lib/resize/resizeimagedialog.cpp
+++ b/lib/resize/resizeimagedialog.cpp
@@ -69,10 +69,10 @@
     setWindowTitle(content->windowTitle());
     d->mWidthSpinBox->setFocus();
 
-    connect(d->mWidthSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &ResizeImageDialog::slotWidthChanged);
-    connect(d->mHeightSpinBox, static_cast<void (QSpinBox::*)(int)>(&QSpinBox::valueChanged), this, &ResizeImageDialog::slotHeightChanged);
-    connect(d->mWidthPercentSpinBox, static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged), this, &ResizeImageDialog::slotWidthPercentChanged);
-    connect(d->mHeightPercentSpinBox, static_cast<void (QDoubleSpinBox::*)(double)>(&QDoubleSpinBox::valueChanged), this, &ResizeImageDialog::slotHeightPercentChanged);
+    connect(d->mWidthSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &ResizeImageDialog::slotWidthChanged);
+    connect(d->mHeightSpinBox, QOverload<int>::of(&QSpinBox::valueChanged), this, &ResizeImageDialog::slotHeightChanged);
+    connect(d->mWidthPercentSpinBox, QOverload<double>::of(&QDoubleSpinBox::valueChanged), this, &ResizeImageDialog::slotWidthPercentChanged);
+    connect(d->mHeightPercentSpinBox, QOverload<double>::of(&QDoubleSpinBox::valueChanged), this, &ResizeImageDialog::slotHeightPercentChanged);
     connect(d->mKeepAspectCheckBox, &QCheckBox::toggled, this, &ResizeImageDialog::slotKeepAspectChanged);
 }