diff --git a/navalplanner-webapp/src/main/webapp/WEB-INF/zk.xml b/navalplanner-webapp/src/main/webapp/WEB-INF/zk.xml
index 3dbd5c673..ea7184b3e 100644
--- a/navalplanner-webapp/src/main/webapp/WEB-INF/zk.xml
+++ b/navalplanner-webapp/src/main/webapp/WEB-INF/zk.xml
@@ -37,4 +37,9 @@
         <value>trendy</value>
     </library-property>
 
+    <library-property>
+        <name>org.zkoss.zul.chart.engine.class</name>
+        <value>com.igalia.java.zk.components.JFreeChartEngine</value>
+    </library-property>
+
 </zk>