diff --git a/projects/Chart/17/org/jfree/data/time/TimeSeries.java b/projects/Chart/17/org/jfree/data/time/TimeSeries.java
index ffd1dff..907fc20 100644
--- a/projects/Chart/17/org/jfree/data/time/TimeSeries.java
+++ b/projects/Chart/17/org/jfree/data/time/TimeSeries.java
@@ -854,7 +854,8 @@ public void delete(int start, int end) {
      *         subclasses may differ.
      */
     public Object clone() throws CloneNotSupportedException {
-        Object clone = createCopy(0, getItemCount() - 1);
+        TimeSeries clone = (TimeSeries) super.clone();
+        clone.data = (List) ObjectUtilities.deepClone(this.data);
         return clone;
     }