diff --git a/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.cpp b/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.cpp
index 52eb6e784b5..27bc1a794d1 100644
--- a/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.cpp
+++ b/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.cpp
@@ -46,8 +46,9 @@ using tCloseButton = QPushButton;
 /**
  * @brief Private data class of public interface CFloatingWidgetTitleBar
  */
-struct FloatingWidgetTitleBarPrivate
+class FloatingWidgetTitleBarPrivate
 {
+public:
     FloatingWidgetTitleBar *q; ///< public interface class
     QLabel *m_iconLabel = nullptr;
     TabLabelType *m_titleLabel;
diff --git a/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.h b/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.h
index f35e096a68f..ed0c4202c93 100644
--- a/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.h
+++ b/src/libs/advanceddockingsystem/linux/floatingwidgettitlebar.h
@@ -30,7 +30,7 @@
 namespace ADS {
 
 class FloatingDockContainer;
-struct FloatingWidgetTitleBarPrivate;
+class FloatingWidgetTitleBarPrivate;
 
 /**
  * Titlebar for floating widgets to capture non client are mouse events.