diff --git a/src/org/semanticweb/owl/align/Alignment.java b/src/org/semanticweb/owl/align/Alignment.java
index b40be7ed2c13e50983f89ed1c0d45b62fda66926..b8bf295952b4ff7d1034e1e66e8cf1140277329a 100644
--- a/src/org/semanticweb/owl/align/Alignment.java
+++ b/src/org/semanticweb/owl/align/Alignment.java
@@ -195,5 +195,9 @@ public interface Alignment extends Cloneable, Iterable<Cell> {
     */
     public void render( AlignmentVisitor renderer ) throws AlignmentException;
 
+    /** Implementation of the clone method
+    */
+    public Object clone();
+
 }