diff --git a/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/TaskList.java b/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/TaskList.java
index e02509c68..9c4c3b553 100644
--- a/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/TaskList.java
+++ b/navalplanner-gantt-zk/src/main/java/org/zkoss/ganttz/TaskList.java
@@ -35,7 +35,7 @@ import org.zkoss.zul.impl.XulElement;
  */
 public class TaskList extends XulElement implements AfterCompose {
 
-    private static final int HEIGHT_PER_ROW = 40;
+    private static final int HEIGHT_PER_ROW = 31;
 
     private List<WeakReference<DependencyAddedListener>> listeners = new LinkedList<WeakReference<DependencyAddedListener>>();