--- a/configure.ac
+++ b/configure.ac
@@ -251,7 +251,7 @@
 AC_LINK_IFELSE(
   [AC_LANG_PROGRAM([#include <miniupnpc/miniupnpc.h>],
                    [struct UPNPDev dev;])],
-  [upnp_version="unknown"],
+  [upnp_version="none"],
   [upnp_version="none"]
 )
 
