diff --git a/doc/kcontrol/cursortheme/index.docbook b/doc/kcontrol/cursortheme/index.docbook
--- a/doc/kcontrol/cursortheme/index.docbook
+++ b/doc/kcontrol/cursortheme/index.docbook
@@ -53,7 +53,7 @@
 </para>
 
 <para>
-The size can be set to the <guilabel>Resolution dependent</guilabel> or one of the sizes available for your theme.
+The size can be set to one of the sizes available for your theme.
 </para>
 
 </article>
diff --git a/kcms/cursortheme/CMakeLists.txt b/kcms/cursortheme/CMakeLists.txt
--- a/kcms/cursortheme/CMakeLists.txt
+++ b/kcms/cursortheme/CMakeLists.txt
@@ -54,6 +54,7 @@
 ########### install files ###############
 
 install(FILES cursorthemesettings.kcfg DESTINATION ${KDE_INSTALL_KCFGDIR})
+install(FILES delete_cursor_old_default_size.upd delete_cursor_old_default_size.pl DESTINATION ${KDE_INSTALL_DATADIR}/kconf_update)
 install( FILES kcm_cursortheme.desktop  DESTINATION  ${KDE_INSTALL_KSERVICES5DIR} )
 install( FILES xcursor/xcursor.knsrc DESTINATION  ${KDE_INSTALL_KNSRCDIR} )
 
diff --git a/kcms/cursortheme/cursorthemesettings.kcfg b/kcms/cursortheme/cursorthemesettings.kcfg
--- a/kcms/cursortheme/cursorthemesettings.kcfg
+++ b/kcms/cursortheme/cursorthemesettings.kcfg
@@ -11,7 +11,7 @@
     </entry>
     <entry name="cursorSize" type="Int">
       <label>Current cursor size</label>
-      <default>0</default>
+      <default>24</default>
     </entry>
   </group>
 </kcfg>
diff --git a/kcms/cursortheme/delete_cursor_old_default_size.pl b/kcms/cursortheme/delete_cursor_old_default_size.pl
new file mode 100644
--- /dev/null
+++ b/kcms/cursortheme/delete_cursor_old_default_size.pl
@@ -0,0 +1,10 @@
+#! /usr/bin/perl
+
+use strict;
+
+while (<>)
+{
+    chomp;
+    s/cursorSize=0/# DELETE cursorSize/;
+    print "$_\n";
+}
diff --git a/kcms/cursortheme/delete_cursor_old_default_size.upd b/kcms/cursortheme/delete_cursor_old_default_size.upd
new file mode 100644
--- /dev/null
+++ b/kcms/cursortheme/delete_cursor_old_default_size.upd
@@ -0,0 +1,8 @@
+Version=5
+
+# Delete cursor size if it's old default
+Id=DeleteCursorOldDefaultSize
+Options=overwrite
+File=kcminputrc
+Group=Mouse
+Script=delete_cursor_old_default_size.pl,perl
diff --git a/kcms/cursortheme/kcmcursortheme.cpp b/kcms/cursortheme/kcmcursortheme.cpp
--- a/kcms/cursortheme/kcmcursortheme.cpp
+++ b/kcms/cursortheme/kcmcursortheme.cpp
@@ -217,11 +217,7 @@
             if (m_pixmap.height() > maxIconHeight) {
                 maxIconHeight = m_pixmap.height();
             }
-            QStandardItem *item = new QStandardItem(QIcon(m_pixmap),
-                i18nc("@item:inlistbox size", "Resolution dependent"));
-            item->setData(0);
-            m_sizesModel->appendRow(item);
-            comboBoxList << 0;
+
             foreach (i, sizes) {
                 m_pixmap = theme->createIcon(i);
                 if (m_pixmap.width() > maxIconWidth) {
@@ -332,9 +328,6 @@
 int CursorThemeConfig::cursorSizeIndex(int cursorSize) const
 {
     if (m_sizesModel->rowCount() > 0) {
-         if (cursorSize  == 0) {
-             return 0;
-         }
          const auto items = m_sizesModel->findItems(QString::number(cursorSize));
          if (items.count() == 1) {
              return items.first()->row();
diff --git a/kcms/krdb/krdb.cpp b/kcms/krdb/krdb.cpp
--- a/kcms/krdb/krdb.cpp
+++ b/kcms/krdb/krdb.cpp
@@ -488,7 +488,7 @@
   // Export the Xcursor theme & size settings
   KConfigGroup mousecfg(KSharedConfig::openConfig( QStringLiteral("kcminputrc") ), "Mouse" );
   QString theme = mousecfg.readEntry("cursorTheme", QString("breeze_cursors"));
-  QString size  = mousecfg.readEntry("cursorSize", QString("0"));
+  QString size  = mousecfg.readEntry("cursorSize", QString("24"));
   QString contents;
 
   if (!theme.isNull())
diff --git a/kcms/lookandfeel/kcm.cpp b/kcms/lookandfeel/kcm.cpp
--- a/kcms/lookandfeel/kcm.cpp
+++ b/kcms/lookandfeel/kcm.cpp
@@ -478,7 +478,7 @@
     // in previous versions the Xfixes code wasn't enabled due to a bug in the
     // build system (freedesktop bug #975).
 #if defined(HAVE_XFIXES) && XFIXES_MAJOR >= 2 && XCURSOR_LIB_VERSION >= 10105
-    const int cursorSize = cg.readEntry("cursorSize", 0);
+    const int cursorSize = cg.readEntry("cursorSize", 24);
 
     QDir themeDir = cursorThemeDir(themeName, 0);
 
diff --git a/kcms/mouse/backends/x11/x11_backend.cpp b/kcms/mouse/backends/x11/x11_backend.cpp
--- a/kcms/mouse/backends/x11/x11_backend.cpp
+++ b/kcms/mouse/backends/x11/x11_backend.cpp
@@ -127,30 +127,20 @@
     auto config = KSharedConfig::openConfig("kcminputrc", KConfig::NoGlobals);
     KConfigGroup group = config->group("Mouse");
     QString theme = group.readEntry("cursorTheme", QString());
-    QString size = group.readEntry("cursorSize", QString());
-
-    int intSize = -1;
-    if (size.isEmpty()) {
-        bool ok;
-        uint value = size.toUInt(&ok);
-        if (ok) {
-            intSize = value;
-        }
-    }
+    const int size = group.readEntry("cursorSize", 24);
+
     // Note: If you update this code, update kapplymousetheme as well.
 
     // use a default value for theme only if it's not configured at all, not even in X resources
     if (theme.isEmpty() && currentCursorTheme().isEmpty()) {
         theme = "breeze_cursors";
     }
-    applyCursorTheme(theme, intSize);
+    applyCursorTheme(theme, size);
 
     // Tell klauncher to set the XCURSOR_THEME and XCURSOR_SIZE environment
     // variables when launching applications.
     if (!theme.isEmpty()) {
         UpdateLaunchEnvJob launchEnvJob(QStringLiteral("XCURSOR_THEME"), theme);
     }
-    if (!size.isEmpty()) {
-        UpdateLaunchEnvJob launchEnvJob(QStringLiteral("XCURSOR_SIZE"), size);
-    }
+    UpdateLaunchEnvJob launchEnvJob(QStringLiteral("XCURSOR_SIZE"), QByteArray::number(size));
 }