1 files changed, 2 insertions, 0 deletions

diff --git a/include/opkele/extension.h b/include/opkele/extension.h
index ea0c74c..513672f 100644
--- a/include/opkele/extension.h
+++ b/include/opkele/extension.h
@@ -10,16 +10,18 @@
 
 namespace opkele {
 
     /**
      * OpenID extension hooks base class
      */
     class extension_t {
         public:
+
+            virtual ~extension_t() { }
             /**
              * hook called by consumer before submitting data to OpenID server.
              * It is supposed to manipulate parameters list.
              * @param p parameters about to be submitted to server
              * @param identity identity being verified. It may differ from the
              * one available in parameters list in case of delegation
              * @see consumer_t::checkid_
              * @see consumer_t::checkid_immediate