diff --git a/sources/editor/elementscene.cpp b/sources/editor/elementscene.cpp
index 8784f31c4..6104fab3f 100644
--- a/sources/editor/elementscene.cpp
+++ b/sources/editor/elementscene.cpp
@@ -1039,14 +1039,7 @@ QList<QGraphicsItem *> ElementScene::zItems(bool include_terminals) const {
 	}
 	
 	// ordonne les parties par leur zValue
-	QMultiMap<qreal, QGraphicsItem *> mm;
-	foreach(QGraphicsItem *qgi, all_items_list) mm.insert(qgi -> zValue(), qgi);
-	all_items_list.clear();
-	QMapIterator<qreal, QGraphicsItem *> i(mm);
-	while (i.hasNext()) {
-		i.next();
-		all_items_list << i.value();
-	}
+	qSort(all_items_list.begin(), all_items_list.end(), ElementScene::zValueLessThan);
 	
 	// rajoute eventuellement les bornes
 	if (include_terminals) all_items_list += terminals;
@@ -1300,3 +1293,10 @@ void ElementScene::snapToGrid(QPointF &point) {
 bool ElementScene::mustSnapToGrid(QGraphicsSceneMouseEvent *e) {
 	return(!(e -> modifiers() & Qt::ControlModifier));
 }
+
+/**
+	@return true if \a item1's zValue() is less than \a item2's.
+*/
+bool ElementScene::zValueLessThan(QGraphicsItem *item1, QGraphicsItem *item2) {
+	return(item1-> zValue() < item2 -> zValue());
+}
diff --git a/sources/editor/elementscene.h b/sources/editor/elementscene.h
index 659cffc39..9e8616756 100644
--- a/sources/editor/elementscene.h
+++ b/sources/editor/elementscene.h
@@ -159,6 +159,7 @@ class ElementScene : public QGraphicsScene {
 	void initPasteArea();
 	void snapToGrid(QPointF &);
 	bool mustSnapToGrid(QGraphicsSceneMouseEvent *);
+	static bool zValueLessThan(QGraphicsItem *, QGraphicsItem *);
 	
 	public slots:
 	void slot_move();