diff --git a/main.cpp b/main.cpp
index 18f4bc570d..e0ea086730 100644
--- a/main.cpp
+++ b/main.cpp
@@ -141,6 +141,7 @@ Application::Application(Application::OperationMode mode, int &argc, char **argv
     , m_configLock(false)
     , m_operationMode(mode)
 {
+    qRegisterMetaType<Options::WindowOperation>("Options::WindowOperation");
 }
 
 void Application::setConfigLock(bool lock)