diff --git a/src/config/advancedpagewidget.h b/src/config/advancedpagewidget.h
index 621efa0..1dfe490 100644
--- a/src/config/advancedpagewidget.h
+++ b/src/config/advancedpagewidget.h
@@ -32,7 +32,7 @@ class QComboBox;
 class AdvancedPageWidget : public QWidget, public Ui::ConfigurePageAdvanced
 {
 public:
-    AdvancedPageWidget(QWidget* parent);
+    explicit AdvancedPageWidget(QWidget* parent);
 
 public:
     QComboBox& comboBackend() {
diff --git a/src/config/filesystemcolorspagewidget.h b/src/config/filesystemcolorspagewidget.h
index fd23c92..2db752e 100644
--- a/src/config/filesystemcolorspagewidget.h
+++ b/src/config/filesystemcolorspagewidget.h
@@ -26,7 +26,7 @@
 class FileSystemColorsPageWidget : public QWidget, public Ui::ConfigurePageFileSystemColors
 {
 public:
-    FileSystemColorsPageWidget(QWidget* parent);
+    explicit FileSystemColorsPageWidget(QWidget* parent);
 };
 
 #endif
diff --git a/src/config/generalpagewidget.h b/src/config/generalpagewidget.h
index 52de33e..89c59af 100644
--- a/src/config/generalpagewidget.h
+++ b/src/config/generalpagewidget.h
@@ -31,7 +31,7 @@ class QString;
 class GeneralPageWidget : public QWidget, public Ui::ConfigurePageGeneral
 {
 public:
-    GeneralPageWidget(QWidget* parent);
+    explicit GeneralPageWidget(QWidget* parent);
 
 public:
     QComboBox& comboDefaultFileSystem() {
diff --git a/src/gui/applyprogressdetailswidget.h b/src/gui/applyprogressdetailswidget.h
index d1a8f70..68b34b2 100644
--- a/src/gui/applyprogressdetailswidget.h
+++ b/src/gui/applyprogressdetailswidget.h
@@ -27,7 +27,7 @@
 class ApplyProgressDetailsWidget : public QWidget, public Ui::ApplyProgressDetailsWidgetBase
 {
 public:
-    ApplyProgressDetailsWidget(QWidget* parent) : QWidget(parent) {
+    explicit ApplyProgressDetailsWidget(QWidget* parent) : QWidget(parent) {
         setupUi(this);
     }
 
diff --git a/src/gui/applyprogressdialogwidget.h b/src/gui/applyprogressdialogwidget.h
index 9961f34..170ecb6 100644
--- a/src/gui/applyprogressdialogwidget.h
+++ b/src/gui/applyprogressdialogwidget.h
@@ -27,7 +27,7 @@
 class ApplyProgressDialogWidget : public QWidget, public Ui::ApplyProgressDialogWidgetBase
 {
 public:
-    ApplyProgressDialogWidget(QWidget* parent);
+    explicit ApplyProgressDialogWidget(QWidget* parent);
 
 public:
     QTreeWidget& treeTasks() {
diff --git a/src/gui/createpartitiontablewidget.h b/src/gui/createpartitiontablewidget.h
index 6ff0973..f637c30 100644
--- a/src/gui/createpartitiontablewidget.h
+++ b/src/gui/createpartitiontablewidget.h
@@ -28,7 +28,7 @@
 class CreatePartitionTableWidget : public QWidget, public Ui::CreatePartitionTableWidgetBase
 {
 public:
-    CreatePartitionTableWidget(QWidget* parent);
+    explicit CreatePartitionTableWidget(QWidget* parent);
 
 public:
     QRadioButton& radioMSDOS() {
diff --git a/src/gui/createvolumegroupdialog.cpp b/src/gui/createvolumegroupdialog.cpp
index b4c0ed2..602e9c0 100644
--- a/src/gui/createvolumegroupdialog.cpp
+++ b/src/gui/createvolumegroupdialog.cpp
@@ -71,7 +71,7 @@ void CreateVolumeGroupDialog::setupDialog()
         if (toBeDeleted)
             continue;
 
-        if (!p.isLuks() && p.vgName() == QString() && !LvmDevice::s_DirtyPVs.contains(p.partition()))
+        if (!p.isLuks() && p.vgName().isEmpty() && !LvmDevice::s_DirtyPVs.contains(p.partition()))
             dialogWidget().listPV().addPartition(*p.partition(), false);
     }
 
diff --git a/src/gui/devicepropswidget.h b/src/gui/devicepropswidget.h
index 5dc8f44..e29baa8 100644
--- a/src/gui/devicepropswidget.h
+++ b/src/gui/devicepropswidget.h
@@ -29,7 +29,7 @@ class PartTableWidget;
 class DevicePropsWidget : public QWidget, public Ui::DevicePropsWidgetBase
 {
 public:
-    DevicePropsWidget(QWidget* parent);
+    explicit DevicePropsWidget(QWidget* parent);
 
 public:
     PartTableWidget& partTableWidget() {
diff --git a/src/gui/filesystemsupportdialog.h b/src/gui/filesystemsupportdialog.h
index 8a6c0fd..e93601f 100644
--- a/src/gui/filesystemsupportdialog.h
+++ b/src/gui/filesystemsupportdialog.h
@@ -38,7 +38,7 @@ class FileSystemSupportDialog : public QDialog
     Q_DISABLE_COPY(FileSystemSupportDialog)
 
 public:
-    FileSystemSupportDialog(QWidget* parent);
+    explicit FileSystemSupportDialog(QWidget* parent);
     ~FileSystemSupportDialog();
 
 public:
diff --git a/src/gui/filesystemsupportdialogwidget.h b/src/gui/filesystemsupportdialogwidget.h
index 302776d..23739f2 100644
--- a/src/gui/filesystemsupportdialogwidget.h
+++ b/src/gui/filesystemsupportdialogwidget.h
@@ -24,7 +24,7 @@
 class FileSystemSupportDialogWidget : public QWidget, public Ui::FileSystemSupportDialogWidgetBase
 {
 public:
-    FileSystemSupportDialogWidget(QWidget* parent);
+    explicit FileSystemSupportDialogWidget(QWidget* parent);
 
 public:
     QTreeWidget& tree() {
diff --git a/src/gui/formattedspinbox.h b/src/gui/formattedspinbox.h
index c8996e9..2c34dea 100644
--- a/src/gui/formattedspinbox.h
+++ b/src/gui/formattedspinbox.h
@@ -24,7 +24,7 @@
 class FormattedSpinBox : public QDoubleSpinBox
 {
 public:
-    FormattedSpinBox(QWidget* parent = nullptr) : QDoubleSpinBox(parent) {}
+    explicit FormattedSpinBox(QWidget* parent = nullptr) : QDoubleSpinBox(parent) {}
 
 public:
     QString textFromValue(double value) const override;
diff --git a/src/gui/infopane.h b/src/gui/infopane.h
index c6101a6..b582755 100644
--- a/src/gui/infopane.h
+++ b/src/gui/infopane.h
@@ -39,7 +39,7 @@ class InfoPane : public QWidget
     Q_DISABLE_COPY(InfoPane)
 
 public:
-    InfoPane(QWidget* parent = nullptr);
+    explicit InfoPane(QWidget* parent = nullptr);
 
 public:
     void showPartition(Qt::DockWidgetArea area, const Partition& p);
diff --git a/src/gui/listdevices.h b/src/gui/listdevices.h
index 6aee317..7b444fc 100644
--- a/src/gui/listdevices.h
+++ b/src/gui/listdevices.h
@@ -38,7 +38,7 @@ class ListDevices : public QWidget, public Ui::ListDevicesBase
     Q_DISABLE_COPY(ListDevices)
 
 public:
-    ListDevices(QWidget* parent = nullptr);
+    explicit ListDevices(QWidget* parent = nullptr);
 
 Q_SIGNALS:
     void selectionChanged(const QString& device_node);
diff --git a/src/gui/listoperations.h b/src/gui/listoperations.h
index 9e63642..5c0a1fe 100644
--- a/src/gui/listoperations.h
+++ b/src/gui/listoperations.h
@@ -38,7 +38,7 @@ class ListOperations : public QWidget, public Ui::ListOperationsBase
     Q_DISABLE_COPY(ListOperations)
 
 public:
-    ListOperations(QWidget* parent = nullptr);
+    explicit ListOperations(QWidget* parent = nullptr);
 
 public:
     void setActionCollection(KActionCollection* coll) {
diff --git a/src/gui/listphysicalvolumes.h b/src/gui/listphysicalvolumes.h
index 7060c75..18c4f79 100644
--- a/src/gui/listphysicalvolumes.h
+++ b/src/gui/listphysicalvolumes.h
@@ -46,7 +46,7 @@ class ListPhysicalVolumes : public QWidget, public Ui::ListPhysicalVolumesBase
     Q_DISABLE_COPY(ListPhysicalVolumes)
 
 public:
-    ListPhysicalVolumes(QWidget* parent = nullptr);
+    explicit ListPhysicalVolumes(QWidget* parent = nullptr);
 
     void addPartition(const Partition& p, bool checked);
 
diff --git a/src/gui/partitionmanagerwidget.h b/src/gui/partitionmanagerwidget.h
index ec5c841..2a59ab1 100644
--- a/src/gui/partitionmanagerwidget.h
+++ b/src/gui/partitionmanagerwidget.h
@@ -45,7 +45,7 @@ class PartitionManagerWidget : public QWidget, Ui::PartitionManagerWidgetBase
     Q_DISABLE_COPY(PartitionManagerWidget)
 
 public:
-    PartitionManagerWidget(QWidget* parent = nullptr);
+    explicit PartitionManagerWidget(QWidget* parent = nullptr);
     virtual ~PartitionManagerWidget();
 
 Q_SIGNALS:
diff --git a/src/gui/partpropswidget.h b/src/gui/partpropswidget.h
index d9e6869..e450a35 100644
--- a/src/gui/partpropswidget.h
+++ b/src/gui/partpropswidget.h
@@ -30,7 +30,7 @@
 class PartPropsWidget : public QWidget, public Ui::PartPropsWidgetBase
 {
 public:
-    PartPropsWidget(QWidget* parent) : QWidget(parent) {
+    explicit PartPropsWidget(QWidget* parent) : QWidget(parent) {
         setupUi(this);
 
         m_PartWidget->setFileSystemColorCode(GuiHelpers::fileSystemColorCodesFromSettings());
diff --git a/src/gui/parttablewidget.h b/src/gui/parttablewidget.h
index 4e4061c..5f5481c 100644
--- a/src/gui/parttablewidget.h
+++ b/src/gui/parttablewidget.h
@@ -38,7 +38,7 @@ class PartTableWidget : public PartWidgetBase
     Q_DISABLE_COPY(PartTableWidget)
 
 public:
-    PartTableWidget(QWidget* parent);
+    explicit PartTableWidget(QWidget* parent);
     qint32 borderWidth() const override {
         return 0;    /**< @return border width */
     }
diff --git a/src/gui/resizevolumegroupdialog.cpp b/src/gui/resizevolumegroupdialog.cpp
index 9acfc28..965554c 100644
--- a/src/gui/resizevolumegroupdialog.cpp
+++ b/src/gui/resizevolumegroupdialog.cpp
@@ -73,7 +73,7 @@ void ResizeVolumeGroupDialog::setupDialog()
                 continue;
             if (p.vgName() == device()->name())
                 dialogWidget().listPV().addPartition(*p.partition(), true);
-            else if (p.vgName() == QString() && !LvmDevice::s_DirtyPVs.contains(p.partition())) // TODO: Remove LVM PVs in current VG
+            else if (p.vgName().isEmpty() && !LvmDevice::s_DirtyPVs.contains(p.partition())) // TODO: Remove LVM PVs in current VG
                 dialogWidget().listPV().addPartition(*p.partition(), false);
         }
 
diff --git a/src/gui/scanprogressdialog.h b/src/gui/scanprogressdialog.h
index 94e3261..b158ffa 100644
--- a/src/gui/scanprogressdialog.h
+++ b/src/gui/scanprogressdialog.h
@@ -23,7 +23,7 @@
 class ScanProgressDialog : public QProgressDialog
 {
 public:
-    ScanProgressDialog(QWidget* parent);
+    explicit ScanProgressDialog(QWidget* parent);
 
     void setProgress(int p) {
         setValue(p);
diff --git a/src/gui/sizedetailswidget.h b/src/gui/sizedetailswidget.h
index 98ba813..c3af339 100644
--- a/src/gui/sizedetailswidget.h
+++ b/src/gui/sizedetailswidget.h
@@ -29,7 +29,7 @@
 class SizeDetailsWidget : public QWidget, public Ui::SizeDetailsWidgetBase
 {
 public:
-    SizeDetailsWidget(QWidget* parent);
+    explicit SizeDetailsWidget(QWidget* parent);
 
 public:
     QDoubleSpinBox& spinFirstSector() {
diff --git a/src/gui/smartdialogwidget.h b/src/gui/smartdialogwidget.h
index 3da6ec2..2f0e2b8 100644
--- a/src/gui/smartdialogwidget.h
+++ b/src/gui/smartdialogwidget.h
@@ -30,7 +30,7 @@ class QPoint;
 class SmartDialogWidget : public QWidget, public Ui::SmartDialogWidgetBase
 {
 public:
-    SmartDialogWidget(QWidget* parent);
+    explicit SmartDialogWidget(QWidget* parent);
     ~SmartDialogWidget();
 
 public:
diff --git a/src/gui/treelog.h b/src/gui/treelog.h
index a60ac1a..4f7db0e 100644
--- a/src/gui/treelog.h
+++ b/src/gui/treelog.h
@@ -35,7 +35,7 @@ class TreeLog: public QWidget, public Ui::TreeLogBase
     Q_DISABLE_COPY(TreeLog)
 
 public:
-    TreeLog(QWidget* parent = nullptr);
+    explicit TreeLog(QWidget* parent = nullptr);
     ~TreeLog();
 
 public:
diff --git a/src/gui/volumegroupwidget.h b/src/gui/volumegroupwidget.h
index 7263d13..7166793 100644
--- a/src/gui/volumegroupwidget.h
+++ b/src/gui/volumegroupwidget.h
@@ -26,7 +26,7 @@
 class  VolumeGroupWidget : public QWidget, public Ui::VolumeGroupWidgetBase
 {
 public:
-    VolumeGroupWidget(QWidget* parent) :
+    explicit VolumeGroupWidget(QWidget* parent) :
         QWidget(parent), Ui::VolumeGroupWidgetBase()
     {
         setupUi(this);