diff --git a/scan/sanedialog.cpp b/scan/sanedialog.cpp
--- a/scan/sanedialog.cpp
+++ b/scan/sanedialog.cpp
@@ -63,14 +63,14 @@
         return true;
     }
     // need to select a scanner
-    m_openDev = m_ksanew->selectDevice(0);
+    m_openDev = m_ksanew->selectDevice(nullptr);
     if (m_openDev.isEmpty()) {
        // either no scanner was found or then cancel was pressed.
         return false;
     }
     if (m_ksanew->openDevice(m_openDev) == false) {
         // could not open the scanner
-        KMessageBox::sorry(0, i18n("Opening the selected scanner failed."));
+        KMessageBox::sorry(nullptr, i18n("Opening the selected scanner failed."));
         m_openDev = QString();
         return false;
     }
diff --git a/widgets/imagelib/effects/kpNumInput.cpp b/widgets/imagelib/effects/kpNumInput.cpp
--- a/widgets/imagelib/effects/kpNumInput.cpp
+++ b/widgets/imagelib/effects/kpNumInput.cpp
@@ -50,9 +50,9 @@
         q(q),
         column1Width(0),
         column2Width(0),
-        label(0),
-        slider(0),
-        labelAlignment(0)
+        label(nullptr),
+        slider(nullptr),
+        labelAlignment(nullptr)
     {
     }
 
@@ -102,8 +102,8 @@
 {
     if (label.isEmpty()) {
         delete d->label;
-        d->label = 0;
-        d->labelAlignment = 0;
+        d->label = nullptr;
+        d->labelAlignment = nullptr;
     } else {
         if (!d->label) {
             d->label = new QLabel(this);
@@ -424,7 +424,7 @@
 {
 public:
     kpDoubleNumInputPrivate()
-        : spin(0) {}
+        : spin(nullptr) {}
     QDoubleSpinBox *spin;
     QSize editSize;
     QString specialValue;