diff --git a/src/share/classes/sun/tools/jconsole/ThreadTab.java b/src/share/classes/sun/tools/jconsole/ThreadTab.java
index 354f351f75083f5ce9c5be2f1e413481c78f8512..3932ffa145e427dcd37ee85c10c1f0453bfbf509 100644
--- a/src/share/classes/sun/tools/jconsole/ThreadTab.java
+++ b/src/share/classes/sun/tools/jconsole/ThreadTab.java
@@ -595,6 +595,7 @@ class ThreadTab extends Tab implements ActionListener, DocumentListener, ListSel
 
             setBorder(thinEmptyBorder);
 
+            setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
             addListSelectionListener(ThreadTab.this);
             setCellRenderer(new DefaultListCellRenderer() {
                 public Component getListCellRendererComponent(JList<?> list, Object value, int index,