diff --git a/simgear/xml/easyxml.hxx b/simgear/xml/easyxml.hxx
index dc7297be..12cb7f50 100644
--- a/simgear/xml/easyxml.hxx
+++ b/simgear/xml/easyxml.hxx
@@ -240,6 +240,12 @@ class XMLVisitor
 {
 public:
 
+  /**
+   * Virtual destructor.
+   */
+  virtual ~XMLVisitor () {}
+
+
   /**
    * Callback for the start of an XML document.
    *