diff --git a/include/wx/aui/auibook.h b/include/wx/aui/auibook.h
index 84d968dd9b..8e4c1b08d7 100644
--- a/include/wx/aui/auibook.h
+++ b/include/wx/aui/auibook.h
@@ -140,7 +140,7 @@ public:
     bool TabHitTest(int x, int y, wxWindow** hit) const;
     bool ButtonHitTest(int x, int y, wxAuiTabContainerButton** hit) const;
     wxWindow* GetWindowFromIdx(size_t idx) const;
-    int GetIdxFromWindow(wxWindow* page) const;
+    int GetIdxFromWindow(const wxWindow* page) const;
     size_t GetPageCount() const;
     wxAuiNotebookPage& GetPage(size_t idx);
     const wxAuiNotebookPage& GetPage(size_t idx) const;
diff --git a/interface/wx/aui/auibook.h b/interface/wx/aui/auibook.h
index b8b91d0ec3..91c63d571a 100644
--- a/interface/wx/aui/auibook.h
+++ b/interface/wx/aui/auibook.h
@@ -523,7 +523,7 @@ public:
     bool TabHitTest(int x, int y, wxWindow** hit) const;
     bool ButtonHitTest(int x, int y, wxAuiTabContainerButton** hit) const;
     wxWindow* GetWindowFromIdx(size_t idx) const;
-    int GetIdxFromWindow(wxWindow* page) const;
+    int GetIdxFromWindow(const wxWindow* page) const;
     size_t GetPageCount() const;
     wxAuiNotebookPage& GetPage(size_t idx);
     const wxAuiNotebookPage& GetPage(size_t idx) const;
diff --git a/src/aui/auibook.cpp b/src/aui/auibook.cpp
index ebea7e1b67..e3fcea5bd2 100644
--- a/src/aui/auibook.cpp
+++ b/src/aui/auibook.cpp
@@ -325,7 +325,7 @@ wxWindow* wxAuiTabContainer::GetWindowFromIdx(size_t idx) const
     return m_pages[idx].window;
 }
 
-int wxAuiTabContainer::GetIdxFromWindow(wxWindow* wnd) const
+int wxAuiTabContainer::GetIdxFromWindow(const wxWindow* wnd) const
 {
     const size_t page_count = m_pages.GetCount();
     for ( size_t i = 0; i < page_count; ++i )