diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java b/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java
index 0a76bf289..31fe29cf9 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/FunctionalityExposedForExtensions.java
@@ -39,13 +39,13 @@ import org.zkoss.ganttz.adapters.PlannerConfiguration;
 import org.zkoss.ganttz.data.Dependency;
 import org.zkoss.ganttz.data.DependencyType;
 import org.zkoss.ganttz.data.GanttDiagramGraph;
+import org.zkoss.ganttz.data.GanttDiagramGraph.GanttZKDiagramGraph;
 import org.zkoss.ganttz.data.ITaskFundamentalProperties;
 import org.zkoss.ganttz.data.Milestone;
 import org.zkoss.ganttz.data.Position;
 import org.zkoss.ganttz.data.Task;
 import org.zkoss.ganttz.data.TaskContainer;
 import org.zkoss.ganttz.data.TaskLeaf;
-import org.zkoss.ganttz.data.GanttDiagramGraph.GanttZKDiagramGraph;
 import org.zkoss.ganttz.data.criticalpath.CriticalPathCalculator;
 import org.zkoss.ganttz.extensions.IContext;
 import org.zkoss.ganttz.timetracker.TimeTracker;
@@ -426,7 +426,7 @@ public class FunctionalityExposedForExtensions<T> implements IContext<T> {
         if (resources.isChecked() == true) {
             parameters.put("resources", "all");
         }
-        parameters.put("zoom", planner.getZoomLevel().toString());
+        parameters.put("zoom", planner.getZoomLevel().getInternalName());
         return parameters;
     }
 
diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/timetracker/zoom/ZoomLevel.java b/ganttzk/src/main/java/org/zkoss/ganttz/timetracker/zoom/ZoomLevel.java
index b0b3364dd..a86a51fa2 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/timetracker/zoom/ZoomLevel.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/timetracker/zoom/ZoomLevel.java
@@ -114,10 +114,14 @@ public enum ZoomLevel {
         return string;
     }
 
-    private String name;
+    private String internalName;
+
+    public String getInternalName() {
+        return internalName;
+    }
 
     private ZoomLevel(String name) {
-        this.name = name;
+        this.internalName = name;
     }
 
     /**
@@ -149,14 +153,14 @@ public enum ZoomLevel {
 
     @Override
     public String toString() {
-        return I18nHelper._(name);
+        return I18nHelper._(internalName);
     }
 
     public static ZoomLevel getFromString(String zoomLevelParameter) {
         ZoomLevel requiredZoomLevel = ZoomLevel.DETAIL_ONE;
         if (zoomLevelParameter != null) {
             for (ZoomLevel z : ZoomLevel.values()) {
-                if (zoomLevelParameter.equals(z.name)) {
+                if (zoomLevelParameter.equals(z.internalName)) {
                     requiredZoomLevel = z;
                 }
             }