diff --git a/include/wx/aui/auibook.h b/include/wx/aui/auibook.h
index 9fb0739e15..5962a661c2 100644
--- a/include/wx/aui/auibook.h
+++ b/include/wx/aui/auibook.h
@@ -236,11 +236,11 @@ protected:
 
 protected:
 
-    wxPoint m_clickPt;
-    wxWindow* m_clickTab;
-    bool m_isDragging;
-    wxAuiTabContainerButton* m_hoverButton;
-    wxAuiTabContainerButton* m_pressedButton;
+    wxPoint m_clickPt = wxDefaultPosition;
+    wxWindow* m_clickTab = nullptr;
+    bool m_isDragging = false;
+    wxAuiTabContainerButton* m_hoverButton = nullptr;
+    wxAuiTabContainerButton* m_pressedButton = nullptr;
 
     void SetHoverTab(wxWindow* wnd);
 
diff --git a/src/aui/auibook.cpp b/src/aui/auibook.cpp
index fe607232fe..88b7300e56 100644
--- a/src/aui/auibook.cpp
+++ b/src/aui/auibook.cpp
@@ -1013,10 +1013,6 @@ wxAuiTabCtrl::wxAuiTabCtrl(wxWindow* parent,
                            long style) : wxControl(parent, id, pos, size, style)
 {
     SetName(wxT("wxAuiTabCtrl"));
-    m_clickPt = wxDefaultPosition;
-    m_isDragging = false;
-    m_hoverButton = nullptr;
-    m_pressedButton = nullptr;
 }
 
 wxAuiTabCtrl::~wxAuiTabCtrl()