diff --git a/include/ResourceModel.h b/include/ResourceModel.h
index cbf8f6546..4368af15f 100644
--- a/include/ResourceModel.h
+++ b/include/ResourceModel.h
@@ -71,6 +71,10 @@ public:
 	int shownItems() const;
 
 
+public slots:
+	virtual void setFilter( const QString & _s ) = 0;
+
+
 protected:
 	ResourceDB * db() const
 	{
diff --git a/include/ResourceTreeModel.h b/include/ResourceTreeModel.h
index 07c111cd9..91c2487d3 100644
--- a/include/ResourceTreeModel.h
+++ b/include/ResourceTreeModel.h
@@ -41,9 +41,9 @@ public:
 	virtual QModelIndex index( int _row, int _col,
 			const QModelIndex & _parent = QModelIndex() ) const;
 
-	virtual QModelIndex parent( const QModelIndex & index ) const;
+	virtual QModelIndex parent( const QModelIndex & _index ) const;
 
-	void setFilter( const QString & _s );
+	virtual void setFilter( const QString & _s );
 
 
 private: