diff --git a/gvc-mixer-control.c b/gvc-mixer-control.c
index 3492925..b6f6a39 100644
--- a/gvc-mixer-control.c
+++ b/gvc-mixer-control.c
@@ -1470,7 +1470,7 @@ update_sink (GvcMixerControl    *control,
                 for (i = 0; i < info->n_ports; i++) {
                         GvcMixerStreamPort *port;
 
-                        port = g_new0 (GvcMixerStreamPort, 1);
+                        port = g_slice_new0 (GvcMixerStreamPort);
                         port->port = g_strdup (info->ports[i]->name);
                         port->human_port = g_strdup (info->ports[i]->description);
                         port->priority = info->ports[i]->priority;
@@ -1598,7 +1598,7 @@ update_source (GvcMixerControl      *control,
                 for (i = 0; i < info->n_ports; i++) {
                         GvcMixerStreamPort *port;
 
-                        port = g_new0 (GvcMixerStreamPort, 1);
+                        port = g_slice_new0 (GvcMixerStreamPort);
                         port->port = g_strdup (info->ports[i]->name);
                         port->human_port = g_strdup (info->ports[i]->description);
                         port->priority = info->ports[i]->priority;
diff --git a/gvc-mixer-stream.c b/gvc-mixer-stream.c
index 5a5c8e6..d3e01b6 100644
--- a/gvc-mixer-stream.c
+++ b/gvc-mixer-stream.c
@@ -88,6 +88,30 @@ static void     gvc_mixer_stream_finalize   (GObject            *object);
 
 G_DEFINE_ABSTRACT_TYPE (GvcMixerStream, gvc_mixer_stream, G_TYPE_OBJECT)
 
+static void
+free_port (GvcMixerStreamPort *p)
+{
+        g_free (p->port);
+        g_free (p->human_port);
+        g_slice_free (GvcMixerStreamPort, p);
+}
+
+static GvcMixerStreamPort *
+dup_port (GvcMixerStreamPort *p)
+{
+        GvcMixerStreamPort *m;
+
+        m = g_slice_new (GvcMixerStreamPort);
+
+        *m = *p;
+        m->port = g_strdup (p->port);
+        m->human_port = g_strdup (p->human_port);
+
+        return m;
+}
+
+G_DEFINE_BOXED_TYPE (GvcMixerStreamPort, gvc_mixer_stream_port, dup_port, free_port)
+
 static guint32
 get_next_stream_serial (void)
 {
@@ -945,14 +969,6 @@ gvc_mixer_stream_init (GvcMixerStream *stream)
         stream->priv = GVC_MIXER_STREAM_GET_PRIVATE (stream);
 }
 
-static void
-free_port (GvcMixerStreamPort *p)
-{
-        g_free (p->port);
-        g_free (p->human_port);
-        g_free (p);
-}
-
 static void
 gvc_mixer_stream_finalize (GObject *object)
 {
diff --git a/gvc-mixer-stream.h b/gvc-mixer-stream.h
index 846f2e0..435f933 100644
--- a/gvc-mixer-stream.h
+++ b/gvc-mixer-stream.h
@@ -64,7 +64,8 @@ typedef struct
         gboolean available;
 } GvcMixerStreamPort;
 
-GType               gvc_mixer_stream_get_type        (void);
+GType               gvc_mixer_stream_port_get_type   (void) G_GNUC_CONST;
+GType               gvc_mixer_stream_get_type        (void) G_GNUC_CONST;
 
 guint               gvc_mixer_stream_get_index       (GvcMixerStream *stream);
 guint               gvc_mixer_stream_get_id          (GvcMixerStream *stream);