diff --git a/src/plugins/platformthemes/gtk3/qgtk3menu.cpp b/src/plugins/platformthemes/gtk3/qgtk3menu.cpp
index 5ca50920a23..5589ff8836e 100644
--- a/src/plugins/platformthemes/gtk3/qgtk3menu.cpp
+++ b/src/plugins/platformthemes/gtk3/qgtk3menu.cpp
@@ -49,6 +49,7 @@ QGtk3MenuItem::QGtk3MenuItem()
       m_checkable(false),
       m_checked(false),
       m_enabled(true),
+      m_exclusive(false),
       m_underline(false),
       m_invalid(true),
       m_menu(nullptr),