diff --git a/src/generic/listctrl.cpp b/src/generic/listctrl.cpp
index 40cb90565f..ee9369a1de 100644
--- a/src/generic/listctrl.cpp
+++ b/src/generic/listctrl.cpp
@@ -2954,7 +2954,7 @@ void wxListMainWindow::InsertItem( wxListItem &item )
     else
     {
         m_lines.Add( line );
-        item.m_itemId = m_lines.GetCount();
+        item.m_itemId = m_lines.GetCount()-1;
     }
 }