diff --git a/src/java/org/apache/commons/lang/text/StrBuilder.java b/src/java/org/apache/commons/lang/text/StrBuilder.java
index 540712c3f..4c1450995 100644
--- a/src/java/org/apache/commons/lang/text/StrBuilder.java
+++ b/src/java/org/apache/commons/lang/text/StrBuilder.java
@@ -67,7 +67,7 @@
  * @since 2.2
  * @version $Id$
  */
-public class StrBuilder {
+public class StrBuilder implements Cloneable {
 
     /**
      * The extra capacity for new builders.