diff --git a/src/org/apache/xalan/xsltc/util/IntegerArray.java b/src/org/apache/xalan/xsltc/util/IntegerArray.java
index c4358d985..62c40fe21 100644
--- a/src/org/apache/xalan/xsltc/util/IntegerArray.java
+++ b/src/org/apache/xalan/xsltc/util/IntegerArray.java
@@ -24,7 +24,7 @@
 /**
  * @author Jacek Ambroziak
  */
-public final class IntegerArray {
+public final class IntegerArray implements Cloneable {
     private static final int InitialSize = 32;
     
     private int[] _array;