diff --git a/src/lib/tools/aesinterface.h b/src/lib/tools/aesinterface.h
index c8f23d7d0..1ffd49438 100644
--- a/src/lib/tools/aesinterface.h
+++ b/src/lib/tools/aesinterface.h
@@ -30,6 +30,8 @@
 
 class QT_QUPZILLA_EXPORT AesInterface : public QObject
 {
+    Q_OBJECT
+
 public:
     static const int VERSION;