diff --git a/src/io/sf/carte/doc/style/css/awt/AWTStyleDatabase.java b/src/io/sf/carte/doc/style/css/awt/AWTStyleDatabase.java
index 49feafd..bc749c9 100644
--- a/src/io/sf/carte/doc/style/css/awt/AWTStyleDatabase.java
+++ b/src/io/sf/carte/doc/style/css/awt/AWTStyleDatabase.java
@@ -35,6 +35,8 @@
  */
 public class AWTStyleDatabase extends AbstractStyleDatabase {
 
+	private static final long serialVersionUID = 1L;
+
 	private GraphicsConfiguration gConfiguration = null;
 
 	/*