diff --git a/gio/gdbusdaemon.c b/gio/gdbusdaemon.c
index ef902d65a..5dfe62cd3 100644
--- a/gio/gdbusdaemon.c
+++ b/gio/gdbusdaemon.c
@@ -1538,34 +1538,6 @@ on_new_connection (GDBusServer *server,
   return TRUE;
 }
 
-static gboolean
-on_authorize_authenticated_peer (GDBusAuthObserver *observer,
-				 GIOStream         *stream,
-				 GCredentials      *credentials,
-				 gpointer           user_data)
-{
-  gboolean authorized = FALSE;
-
-  if (credentials != NULL)
-    {
-      GCredentials *own_credentials;
-
-      own_credentials = g_credentials_new ();
-      authorized = g_credentials_is_same_user (credentials, own_credentials, NULL);
-      g_object_unref (own_credentials);
-    }
-#ifdef G_OS_WIN32
-  else
-    {
-      /* We allow ANONYMOUS authentication on Windows for now, in
-       * combination with the nonce-tcp transport. */
-      authorized = TRUE;
-    }
-#endif
-
-  return authorized;
-}
-
 static void
 g_dbus_daemon_finalize (GObject *object)
 {
@@ -1615,7 +1587,6 @@ initable_init (GInitable     *initable,
 	       GError       **error)
 {
   GDBusDaemon *daemon = G_DBUS_DAEMON (initable);
-  GDBusAuthObserver *observer;
   GDBusServerFlags flags;
 
   flags = G_DBUS_SERVER_FLAGS_NONE;
@@ -1629,24 +1600,23 @@ initable_init (GInitable     *initable,
 	  daemon->tmpdir = g_dir_make_tmp ("gdbus-daemon-XXXXXX", NULL);
 	  daemon->address = g_strdup_printf ("unix:tmpdir=%s", daemon->tmpdir);
 	}
+      flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER;
 #else
+      /* Don’t require authentication on Windows as that hasn’t been
+       * implemented yet. */
       daemon->address = g_strdup ("nonce-tcp:");
       flags |= G_DBUS_SERVER_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS;
 #endif
     }
 
-  observer = g_dbus_auth_observer_new ();
   daemon->server = g_dbus_server_new_sync (daemon->address,
 					   flags,
 					   daemon->guid,
-					   observer,
+					   NULL,
 					   cancellable,
 					   error);
   if (daemon->server == NULL)
-    {
-      g_object_unref (observer);
-      return FALSE;
-    }
+    return FALSE;
 
 
   g_dbus_server_start (daemon->server);
@@ -1654,12 +1624,6 @@ initable_init (GInitable     *initable,
   g_signal_connect (daemon->server, "new-connection",
 		    G_CALLBACK (on_new_connection),
 		    daemon);
-  g_signal_connect (observer,
-		    "authorize-authenticated-peer",
-		    G_CALLBACK (on_authorize_authenticated_peer),
-		    daemon);
-
-  g_object_unref (observer);
 
   return TRUE;
 }