diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/part/WindowContainer.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/part/WindowContainer.java
index 451973af13..13ee3e64c6 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/part/WindowContainer.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/part/WindowContainer.java
@@ -495,6 +495,7 @@ public class WindowContainer extends AbstractUIPart implements EventListener<Eve
 			return;
 		if (title.length() <= MAX_TITLE_LENGTH) 
 		{
+			tab.setTooltiptext(null);
 			tab.setLabel(title);
 		}
 		else