diff --git a/shell/scripting/applet.h b/shell/scripting/applet.h
--- a/shell/scripting/applet.h
+++ b/shell/scripting/applet.h
@@ -21,6 +21,7 @@
 #define APPLET
 
 #include <QObject>
+#include <QJSValue>
 #include <QWeakPointer>
 
 #include <kconfiggroup.h>
@@ -66,10 +67,10 @@
     void reloadConfigIfNeeded();
 
 public Q_SLOTS:
-    virtual QVariant readConfig(const QString &key, const QVariant &def = QString()) const;
-    virtual void writeConfig(const QString &key, const QVariant &value);
-    virtual QVariant readGlobalConfig(const QString &key, const QVariant &def = QString()) const;
-    virtual void writeGlobalConfig(const QString &key, const QVariant &value);
+    virtual QVariant readConfig(const QString &key, const QJSValue &def = QString()) const;
+    virtual void writeConfig(const QString &key, const QJSValue &value);
+    virtual QVariant readGlobalConfig(const QString &key, const QJSValue &def = QString()) const;
+    virtual void writeGlobalConfig(const QString &key, const QJSValue &value);
     virtual void reloadConfig();
 
 private:
diff --git a/shell/scripting/applet.cpp b/shell/scripting/applet.cpp
--- a/shell/scripting/applet.cpp
+++ b/shell/scripting/applet.cpp
@@ -102,30 +102,30 @@
     return QStringList();
 }
 
-QVariant Applet::readConfig(const QString &key, const QVariant &def) const
+QVariant Applet::readConfig(const QString &key, const QJSValue &def) const
 {
     if (d->configGroup.isValid()) {
-        return d->configGroup.readEntry(key, def);
+        return d->configGroup.readEntry(key, def.toVariant());
     } else {
         return QVariant();
     }
 }
 
-void Applet::writeConfig(const QString &key, const QVariant &value)
+void Applet::writeConfig(const QString &key, const QJSValue &value)
 {
     if (d->configGroup.isValid()) {
         if (d->inWallpaperConfig) {
             //hacky, but only way to make the wallpaper react immediately
             QObject *wallpaperGraphicsObject = applet()->property("wallpaperGraphicsObject").value<QObject *>();
             if (wallpaperGraphicsObject) {
                 KDeclarative::ConfigPropertyMap *config = static_cast<KDeclarative::ConfigPropertyMap *>(wallpaperGraphicsObject->property("configuration").value<QObject *>());
-                config->setProperty(key.toLatin1(), value);
+                config->setProperty(key.toLatin1(), value.toVariant());
             }
         } else if (applet()->configScheme()) {
             //check if it can be written in the applets' configScheme
             KConfigSkeletonItem *item = applet()->configScheme()->findItemByName(key);
             if (item) {
-                item->setProperty(value);
+                item->setProperty(value.toVariant());
                 applet()->configScheme()->blockSignals(true);
                 applet()->configScheme()->save();
                 //why read? read will update KConfigSkeletonItem::mLoadedValue,
@@ -136,7 +136,7 @@
             }
         }
 
-        d->configGroup.writeEntry(key, value);
+        d->configGroup.writeEntry(key, value.toVariant());
         d->configDirty = true;
     }
 }
@@ -181,19 +181,19 @@
     return QStringList();
 }
 
-QVariant Applet::readGlobalConfig(const QString &key, const QVariant &def) const
+QVariant Applet::readGlobalConfig(const QString &key, const QJSValue &def) const
 {
     if (d->globalConfigGroup.isValid()) {
-        return d->globalConfigGroup.readEntry(key, def);
+        return d->globalConfigGroup.readEntry(key, def.toVariant());
     } else {
         return QVariant();
     }
 }
 
-void Applet::writeGlobalConfig(const QString &key, const QVariant &value)
+void Applet::writeGlobalConfig(const QString &key, const QJSValue &value)
 {
     if (d->globalConfigGroup.isValid()) {
-        d->globalConfigGroup.writeEntry(key, value);
+        d->globalConfigGroup.writeEntry(key, value.toVariant());
         d->configDirty = true;
     }
 }
diff --git a/shell/scripting/configgroup.h b/shell/scripting/configgroup.h
--- a/shell/scripting/configgroup.h
+++ b/shell/scripting/configgroup.h
@@ -22,6 +22,7 @@
 
 #include <QObject>
 #include <QVariant>
+#include <QJSValue>
 
 #include <KSharedConfig>
 
@@ -52,7 +53,7 @@
     QStringList groupList() const;
 
     Q_INVOKABLE QVariant readEntry(const QString &key);
-    Q_INVOKABLE bool writeEntry(const QString &key, const QVariant &value);
+    Q_INVOKABLE bool writeEntry(const QString &key, const QJSValue &value);
     Q_INVOKABLE void deleteEntry(const QString& key);
 
 Q_SIGNALS:
diff --git a/shell/scripting/configgroup.cpp b/shell/scripting/configgroup.cpp
--- a/shell/scripting/configgroup.cpp
+++ b/shell/scripting/configgroup.cpp
@@ -181,13 +181,13 @@
 
 // Bound methods and slots
 
-bool ConfigGroup::writeEntry(const QString& key, const QVariant& value)
+bool ConfigGroup::writeEntry(const QString& key, const QJSValue& value)
 {
     if (!d->configGroup) {
         return false;
     }
 
-    d->configGroup->writeEntry(key, value);
+    d->configGroup->writeEntry(key, value.toVariant());
     d->synchTimer->start();
     return true;
 }
diff --git a/shell/scripting/scriptengine_v1.cpp b/shell/scripting/scriptengine_v1.cpp
--- a/shell/scripting/scriptengine_v1.cpp
+++ b/shell/scripting/scriptengine_v1.cpp
@@ -323,7 +323,7 @@
 
         // Read other properties and set the configuration
         SCRIPT_OBJECT_FOREACH(key, value, config) {
-            object->writeConfig(key, value.toVariant());
+            object->writeConfig(key, value);
         };
     };
 }