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--- a/libupnpp/upnpplib.hxx
+++ b/libupnpp/upnpplib.hxx
@@ -25,7 +25,7 @@
 
 /** Version components. */
 #define LIBUPNPP_VERSION_MAJOR 0
-#define LIBUPNPP_VERSION_MINOR 16
+#define LIBUPNPP_VERSION_MINOR 17
 #define LIBUPNPP_VERSION_REVISION 0
 /// Got this from Xapian...
 #define LIBUPNPP_AT_LEAST(A,B,C)                                        \
@@ -155,7 +155,11 @@
     LibUPnP(const LibUPnP &);
     LibUPnP& operator=(const LibUPnP &);
 
-    static int o_callback(Upnp_EventType, void *, void *);
+    static int o_callback(Upnp_EventType,
+#if UPNP_VERSION_MINOR >= 8
+                          const
+#endif
+                          void *, void *);
 };
 
 } // namespace UPnPP