diff --git a/applets/kicker/plugin/recentusagemodel.h b/applets/kicker/plugin/recentusagemodel.h
--- a/applets/kicker/plugin/recentusagemodel.h
+++ b/applets/kicker/plugin/recentusagemodel.h
@@ -47,6 +47,7 @@
 
     protected:
         bool filterAcceptsRow(int source_row, const QModelIndex & source_parent) const Q_DECL_OVERRIDE;
+        bool lessThan(const QModelIndex &left, const QModelIndex &right) const override;
 
     private Q_SLOTS:
         void connectNewFavoritesModel();
diff --git a/applets/kicker/plugin/recentusagemodel.cpp b/applets/kicker/plugin/recentusagemodel.cpp
--- a/applets/kicker/plugin/recentusagemodel.cpp
+++ b/applets/kicker/plugin/recentusagemodel.cpp
@@ -97,6 +97,11 @@
     return true;
 }
 
+bool InvalidAppsFilterProxy::lessThan(const QModelIndex &left, const QModelIndex &right) const
+{
+    return (left.row() < right.row());
+}
+
 bool GroupSortProxy::lessThan(const QModelIndex &left, const QModelIndex &right) const
 {
     const QString &lResource = sourceModel()->data(left, ResultModel::ResourceRole).toString();