diff --git a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgHookCallbackServlet.java b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgHookCallbackServlet.java
index 94f51855d8..2dc5863a05 100644
--- a/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgHookCallbackServlet.java
+++ b/scm-plugins/scm-hg-plugin/src/main/java/sonia/scm/web/HgHookCallbackServlet.java
@@ -102,6 +102,9 @@ public class HgHookCallbackServlet extends HttpServlet
   private static final Logger logger =
     LoggerFactory.getLogger(HgHookCallbackServlet.class);
 
+  /** Field description */
+  private static final long serialVersionUID = 3531596724828189353L;
+
   //~--- constructors ---------------------------------------------------------
 
   /**