diff --git a/libreplan-webapp/src/main/webapp/orders/components/_orderElementTree.zul b/libreplan-webapp/src/main/webapp/orders/components/_orderElementTree.zul
index 3c7bbf2e6..f08089557 100644
--- a/libreplan-webapp/src/main/webapp/orders/components/_orderElementTree.zul
+++ b/libreplan-webapp/src/main/webapp/orders/components/_orderElementTree.zul
@@ -79,7 +79,7 @@
 
     </vbox>
     <vbox width="100%">
-        <tree id="tree" height="440px" multiple="false" droppable="true"
+        <tree id="tree" hflex="1" multiple="false" droppable="true"
             onDrop="treeController.move(self, event.dragged)"
             onSelect="treeController.updateControlButtons(event)"
             mold="paging" pageSize="25"