diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java b/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
index a5e4d82f8..5c20e4709 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/TaskComponent.java
@@ -222,7 +222,7 @@ public class TaskComponent extends Div implements AfterCompose {
             cssClass += task.isLimitingAndHasDayAssignments() ? " limiting-assigned "
                     : " limiting-unassigned ";
         }
-        if (task.belongsClosedProject()) {
+        if (task.isRoot() && task.belongsClosedProject()) {
             cssClass += " project-closed ";
         }
         return cssClass;