diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/Planner.java b/ganttzk/src/main/java/org/zkoss/ganttz/Planner.java
index 9d65f4b43..06f94f552 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/Planner.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/Planner.java
@@ -340,9 +340,11 @@ public class Planner extends HtmlMacroComponent  {
                 String command = request.getCommand();
                 String[] requestData;
                 int zoomindex;
+                int scrollLeft;
 
                 if (command.equals("onZoomLevelChange")){
                     zoomindex=  (Integer) retrieveData(request, "zoomindex");
+                    scrollLeft = (Integer) retrieveData(request, "scrollLeft");
 
                     setZoomLevel((ZoomLevel)((Listbox)getFellow("listZoomLevels")).getModel().getElementAt(zoomindex));
                     return true;
diff --git a/ganttzk/src/main/resources/web/js/ganttz/Planner.js b/ganttzk/src/main/resources/web/js/ganttz/Planner.js
index 7cc34ddf5..697640d57 100644
--- a/ganttzk/src/main/resources/web/js/ganttz/Planner.js
+++ b/ganttzk/src/main/resources/web/js/ganttz/Planner.js
@@ -57,7 +57,8 @@ ganttz.Planner = zk.$extends(zk.Macro,{
     },
     _zoomLevelChanged : function(event){
         var zoomindex = event.domTarget.selectedIndex;
-        zAu.send(new zk.Event(this, 'onZoomLevelChange', {zoomindex : zoomindex}));
+        var scrollLeft = jq('#timetracker').scrollLeft();
+        zAu.send(new zk.Event(this, 'onZoomLevelChange', {zoomindex : zoomindex, scrollLeft : scrollLeft}));
     }
 },{
     FOOTER_HEIGHT : 40, // Design-relative footer height