diff --git a/include/wx/window.h b/include/wx/window.h
index 2fafa644c4..632cea3313 100644
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -2148,7 +2148,7 @@ extern WXDLLIMPEXP_CORE wxWindow *wxGetActiveWindow();
 WXDLLIMPEXP_CORE wxWindow* wxGetTopLevelParent(wxWindowBase *win);
 
 // Return a string with platform-dependent description of the window.
-extern WXDLLIMPEXP_CORE wxString wxDumpWindow(wxWindowBase* win);
+extern WXDLLIMPEXP_CORE wxString wxDumpWindow(const wxWindowBase* win);
 
 #if wxUSE_ACCESSIBILITY
 // ----------------------------------------------------------------------------
diff --git a/interface/wx/window.h b/interface/wx/window.h
index 09f275316e..1688fd5ed8 100644
--- a/interface/wx/window.h
+++ b/interface/wx/window.h
@@ -4364,7 +4364,7 @@ wxWindow* wxGetTopLevelParent(wxWindow* window);
 
     @since 3.1.6
  */
-wxString wxDumpWindow(wxWindow* window);
+wxString wxDumpWindow(const wxWindow* window);
 
 //@}
 
diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 92cf9bbdac..8474741074 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -3722,7 +3722,7 @@ wxWindow* wxGetTopLevelParent(wxWindowBase *win_)
     return win;
 }
 
-wxString wxDumpWindow(wxWindowBase* win)
+wxString wxDumpWindow(const wxWindowBase* win)
 {
     if ( !win )
         return wxString::FromAscii("[no window]");