diff --git a/upnp/src/inc/inet_pton.h b/upnp/src/inc/inet_pton.h
index 38f884e..bf25365 100644
--- a/upnp/src/inc/inet_pton.h
+++ b/upnp/src/inc/inet_pton.h
@@ -40,7 +40,7 @@
  *	\li (2) takes a u_char* not an in_addr as input
  *
  */
-extern const char *inet_ntop4(const u_char src, char *dst, socklen_t size);
+extern const char *inet_ntop4(const u_char *src, char *dst, socklen_t size);
 
 
 /*!