diff --git a/src/offline.cpp b/src/offline.cpp
index d4eaedb..b5e4dc8 100644
--- a/src/offline.cpp
+++ b/src/offline.cpp
@@ -26,6 +26,7 @@ using namespace PackageKit;
 Offline::Offline(QObject *parent) : QObject(parent)
   , d_ptr(new OfflinePrivate(this))
 {
+    qRegisterMetaType<Transaction::Role>();
     QDBusConnection::systemBus().connect(PK_NAME,
                                          PK_PATH,
                                          DBUS_PROPERTIES,