diff --git a/tools/alsa_out.c b/tools/alsa_out.c
index f0995ed..a543ae8 100644
--- a/tools/alsa_out.c
+++ b/tools/alsa_out.c
@@ -468,7 +468,7 @@ again:
 
 void alloc_ports( int n_capture, int n_playback ) {
 
-    int port_flags = JackPortIsOutput;
+    int port_flags = JackPortIsOutput | JackPortIsPhysical | JackPortIsTerminal;
     int chn;
     jack_port_t *port;
     char buf[32];