diff --git a/hw/audio/adlib.c b/hw/audio/adlib.c
index bd8e9d9815..e88d2dd845 100644
--- a/hw/audio/adlib.c
+++ b/hw/audio/adlib.c
@@ -347,8 +347,8 @@ static void adlib_realizefn (DeviceState *dev, Error **errp)
     s->samples = AUD_get_buffer_size_out (s->voice) >> SHIFT;
     s->mixbuf = g_malloc0 (s->samples << SHIFT);
 
-    adlib_portio_list[1].offset = s->port;
-    adlib_portio_list[2].offset = s->port + 8;
+    adlib_portio_list[0].offset = s->port;
+    adlib_portio_list[1].offset = s->port + 8;
     portio_list_init (port_list, OBJECT(s), adlib_portio_list, s, "adlib");
     portio_list_add (port_list, isa_address_space_io(&s->parent_obj), 0);
 }