*** empty log message ***
diff --git a/update/org.eclipse.update.ui/src/org/eclipse/update/internal/ui/wizards/NewUpdatesWizard.java b/update/org.eclipse.update.ui/src/org/eclipse/update/internal/ui/wizards/NewUpdatesWizard.java
index 0e446fe..a578537 100644
--- a/update/org.eclipse.update.ui/src/org/eclipse/update/internal/ui/wizards/NewUpdatesWizard.java
+++ b/update/org.eclipse.update.ui/src/org/eclipse/update/internal/ui/wizards/NewUpdatesWizard.java
@@ -236,6 +236,9 @@
 				InstallWizard.preserveOptionalState(config, targetSite, false, optionalElements.toArray());
 			}
 			if (oldFeature!=null) unconfigure(oldFeature);
+			else {
+				MultiInstallWizard.ensureUnique(config, feature, targetSite);
+			}
 		}
 		UpdateModel model = UpdateUI.getDefault().getUpdateModel();
 		model.addPendingChange(job);