diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -52,7 +52,7 @@
   KDescendantsProxyModel
   KModelIndexProxyMapper
   KSelectionProxyModel
-
+  KNumberModel
   REQUIRED_HEADERS KItemModels_HEADERS
 )
 
diff --git a/src/qml/plugin.cpp b/src/qml/plugin.cpp
--- a/src/qml/plugin.cpp
+++ b/src/qml/plugin.cpp
@@ -23,6 +23,7 @@
 #include <QDebug>
 
 #include <KDescendantsProxyModel>
+#include <KNumberModel>
 #include "kconcatenaterowsproxymodel_qml.h"
 
 void Plugin::initializeEngine(QQmlEngine *engine, const char *uri)
@@ -34,6 +35,7 @@
     qmlRegisterType<QAbstractItemModel>();
     qmlRegisterExtendedType<KConcatenateRowsProxyModel,KConcatenateRowsProxyModelQml>(uri, 1, 0, "KConcatenateRowsProxyModel");
     qmlRegisterType<KDescendantsProxyModel>(uri, 1, 0, "KDescendantsProxyModel");
+    qmlRegisterType<KNumberModel>(uri, 1, 0, "KNumberModel");
 }