diff --git a/gio/gdbusconnection.c b/gio/gdbusconnection.c
index 91438f237..0fac67009 100644
--- a/gio/gdbusconnection.c
+++ b/gio/gdbusconnection.c
@@ -122,13 +122,14 @@
 
 #include "glibintl.h"
 
-#define G_DBUS_CONNECTION_FLAGS_ALL \
-  (G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT | \
-   G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER | \
-   G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS | \
-   G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION | \
-   G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING | \
-   G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER)
+#define G_DBUS_CONNECTION_FLAGS_ALL                           \
+  (G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |            \
+   G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER |            \
+   G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS |   \
+   G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION |           \
+   G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING |         \
+   G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_REQUIRE_SAME_USER | \
+   G_DBUS_CONNECTION_FLAGS_CROSS_NAMESPACE)
 
 /**
  * GDBusConnection: