diff --git a/src/libs/advanceddockingsystem/floatingdragpreview.cpp b/src/libs/advanceddockingsystem/floatingdragpreview.cpp
index b8c3406af94..33e0a5ac346 100644
--- a/src/libs/advanceddockingsystem/floatingdragpreview.cpp
+++ b/src/libs/advanceddockingsystem/floatingdragpreview.cpp
@@ -60,13 +60,12 @@ namespace ADS
     {
     public:
         FloatingDragPreview *q;
-        QWidget *m_content;
+        QWidget *m_content = nullptr;
         DockAreaWidget *m_contentSourceArea = nullptr;
         DockContainerWidget *m_contenSourceContainer = nullptr;
         QPoint m_dragStartMousePosition;
-        DockManager *m_dockManager;
+        DockManager *m_dockManager = nullptr;
         DockContainerWidget *m_dropContainer = nullptr;
-        qreal m_windowOpacity;
         bool m_hidden = false;
         QPixmap m_contentPreviewPixmap;