diff --git a/tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/views/ManyEntriesSelectedDialogPreCheckedListener.java b/tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/views/ManyEntriesSelectedDialogPreCheckedListener.java
index b73c7d89ab..a5c495579c 100644
--- a/tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/views/ManyEntriesSelectedDialogPreCheckedListener.java
+++ b/tmf/org.eclipse.tracecompass.tmf.ui/src/org/eclipse/tracecompass/tmf/ui/views/ManyEntriesSelectedDialogPreCheckedListener.java
@@ -48,7 +48,7 @@ public ManyEntriesSelectedDialogPreCheckedListener(FilteredCheckboxTree filtered
     public boolean setSubtreeChecked(Object element, boolean state) {
         if (state) {
             ITreeContentProvider contentProvider = (ITreeContentProvider) fFilteredCheckboxTree.getCheckboxTreeViewer().getContentProvider();
-            int nb = fFilteredCheckboxTree.getCheckedElements().length + getSubTreeSize(contentProvider, element);
+            int nb = fFilteredCheckboxTree.getCheckedElements().length + getSubTreeSize(contentProvider, element) - 1;
             return showWarning(nb);
         }
         return false;