diff --git a/src/lib/upnp/Init.cxx b/src/lib/upnp/Init.cxx
index ac2167fb8..321ff7196 100644
--- a/src/lib/upnp/Init.cxx
+++ b/src/lib/upnp/Init.cxx
@@ -34,7 +34,7 @@ static unsigned upnp_ref;
 static void
 DoInit()
 {
-	auto code = UpnpInit(0, 0);
+	auto code = UpnpInit(nullptr, 0);
 	if (code != UPNP_E_SUCCESS)
 		throw FormatRuntimeError("UpnpInit() failed: %s",
 					 UpnpGetErrorMessage(code));