diff --git a/lib/wp/session.c b/lib/wp/session.c
index e0f0092b..4c9d9f72 100644
--- a/lib/wp/session.c
+++ b/lib/wp/session.c
@@ -11,12 +11,14 @@
 
 enum {
   PROP_0,
-  PROP_DIRECTION
+  PROP_DIRECTION,
+  PROP_MEDIA_CLASS,
 };
 
 typedef struct
 {
   WpSessionDirection direction;
+  gchar media_class[41];
 } WpSessionPrivate;
 
 G_DEFINE_TYPE_WITH_PRIVATE (WpSession, wp_session, WP_TYPE_OBJECT)
@@ -36,6 +38,9 @@ wp_session_set_property (GObject * object, guint property_id,
   case PROP_DIRECTION:
     priv->direction = g_value_get_enum (value);
     break;
+  case PROP_MEDIA_CLASS:
+    strncpy (priv->media_class, g_value_get_string (value), 40);
+    break;
   default:
     G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
     break;
@@ -52,6 +57,9 @@ wp_session_get_property (GObject * object, guint property_id, GValue * value,
   case PROP_DIRECTION:
     g_value_set_enum (value, priv->direction);
     break;
+  case PROP_MEDIA_CLASS:
+    g_value_set_string (value, priv->media_class);
+    break;
   default:
     G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
     break;
@@ -71,12 +79,23 @@ wp_session_class_init (WpSessionClass * klass)
           "The media flow direction of the session",
           WP_TYPE_SESSION_DIRECTION, 0,
           G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
+
+  g_object_class_install_property (object_class, PROP_MEDIA_CLASS,
+      g_param_spec_string ("media-class", "media-class",
+          "The media class of the session", NULL,
+          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
 }
 
 WpSessionDirection
 wp_session_get_direction (WpSession * self)
 {
-  WpSessionDirection dir;
-  g_object_get (self, "direction", &dir, NULL);
-  return dir;
+  WpSessionPrivate *priv = wp_session_get_instance_private (self);
+  return priv->direction;
+}
+
+const gchar *
+wp_session_get_media_class (WpSession * self)
+{
+  WpSessionPrivate *priv = wp_session_get_instance_private (self);
+  return priv->media_class;
 }
diff --git a/lib/wp/session.h b/lib/wp/session.h
index 7c269155..8c0fc642 100644
--- a/lib/wp/session.h
+++ b/lib/wp/session.h
@@ -27,8 +27,7 @@ struct _WpSessionClass
 };
 
 WpSessionDirection wp_session_get_direction (WpSession * session);
-
-#define WP_SESSION_PW_PROP_MEDIA_CLASS "media.class"
+const gchar *wp_session_get_media_class (WpSession * session);
 
 G_END_DECLS
 
diff --git a/modules/module-default-session.c b/modules/module-default-session.c
index 703e9a6e..ab0f2c0e 100644
--- a/modules/module-default-session.c
+++ b/modules/module-default-session.c
@@ -54,10 +54,13 @@ session_class_init (DefaultSessionClass * klass)
 }
 
 static DefaultSession *
-session_new (WpProxy * device_node, guint32 type, WpSessionDirection dir)
+session_new (WpProxy * device_node, guint32 type, WpSessionDirection dir,
+    const gchar * media_class)
 {
-  DefaultSession *sess =
-      g_object_new (session_get_type (), "direction", dir, NULL);
+  DefaultSession *sess = g_object_new (session_get_type (),
+      "direction", dir,
+      "media-class", media_class,
+      NULL);
 
   sess->device_node = device_node;
   sess->media_type = type;
@@ -126,7 +129,7 @@ handle_node (WpPlugin * self, WpProxy * proxy)
       wp_proxy_get_id (proxy), wp_proxy_get_spa_type_string (proxy),
       media_class);
 
-  session = session_new (proxy, media_type, direction);
+  session = session_new (proxy, media_type, direction, media_class);
 
   core = wp_plugin_get_core (self);
   sr = wp_object_get_interface (core, WP_TYPE_SESSION_REGISTRY);
diff --git a/src/session-registry-impl.c b/src/session-registry-impl.c
index e1a1713a..22fb42fb 100644
--- a/src/session-registry-impl.c
+++ b/src/session-registry-impl.c
@@ -105,7 +105,6 @@ register_session (WpSessionRegistry * sr,
 {
   WpSessionRegistryImpl * self = WP_SESSION_REGISTRY_IMPL (sr);
   WpPluginRegistry *plugin_registry = NULL;
-  WpPipewireProperties *pw_props = NULL;
   const gchar *media_class = NULL;
   SessionData data;
 
@@ -114,16 +113,7 @@ register_session (WpSessionRegistry * sr,
   wp_plugin_registry_impl_invoke (plugin_registry,
       wp_plugin_provide_interfaces, WP_OBJECT (session));
 
-  pw_props = wp_object_get_interface (WP_OBJECT (session),
-      WP_TYPE_PIPEWIRE_PROPERTIES);
-  if (!pw_props) {
-    g_set_error (error, WP_DOMAIN_CORE, WP_CODE_INVALID_ARGUMENT,
-        "session object does not implement WpPipewirePropertiesInterface");
-    return -1;
-  }
-
-  media_class = wp_pipewire_properties_get (pw_props,
-        WP_SESSION_PW_PROP_MEDIA_CLASS);
+  media_class = wp_session_get_media_class (session);
   if (!media_class) {
      g_set_error (error, WP_DOMAIN_CORE, WP_CODE_INVALID_ARGUMENT,
         "session media_class is NULL");