diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/resource/ResourceCollection.java b/jetty-util/src/main/java/org/eclipse/jetty/util/resource/ResourceCollection.java
index 4b8b8818d179..3f080072465a 100644
--- a/jetty-util/src/main/java/org/eclipse/jetty/util/resource/ResourceCollection.java
+++ b/jetty-util/src/main/java/org/eclipse/jetty/util/resource/ResourceCollection.java
@@ -440,7 +440,6 @@ public String[] list()
             String[] list = r.list();
             if (list != null)
                 Collections.addAll(set, list);
-            Collections.addAll(set, r.list());
         }
         String[] result = set.toArray(new String[0]);
         Arrays.sort(result);