diff --git a/build/inc/autoconfig.h b/build/inc/autoconfig.h
index 6c94e5a..2c69fa7 100644
--- a/build/inc/autoconfig.h
+++ b/build/inc/autoconfig.h
@@ -132,6 +132,9 @@
 /* see upnpconfig.h */
 #define UPNP_ENABLE_NOTIFICATION_REORDERING 1
 
+/* see upnpconfig.h */
+/* #undef UPNP_ENABLE_OPEN_SSL */
+
 /* see upnpconfig.h */
 #define UPNP_HAVE_CLIENT 1
 
diff --git a/build/inc/upnpconfig.h b/build/inc/upnpconfig.h
index 2a9c92e..b43adb8 100644
--- a/build/inc/upnpconfig.h
+++ b/build/inc/upnpconfig.h
@@ -108,5 +108,9 @@
  *  (i.e. configure --enable-ipv6) */
 /* #undef UPNP_ENABLE_IPV6 */
 
+/** Defined to 1 if the library has been compiled with OpenSSL support
+ *  (i.e. configure --enable-open_ssl) */
+/* #undef UPNP_ENABLE_OPEN_SSL */
+
 #endif /* UPNP_CONFIG_H */