diff --git a/include/wx/window.h b/include/wx/window.h
index d5fc672391..e431b9c83a 100644
--- a/include/wx/window.h
+++ b/include/wx/window.h
@@ -965,7 +965,7 @@ protected:
 
     // Makes an adjustment to the window position (for example, a frame that has
     // a toolbar that it manages itself).
-    virtual void AdjustForParentClientOrigin(int& x, int& y, int sizeFlags);
+    virtual void AdjustForParentClientOrigin(int& x, int& y, int sizeFlags) const;
 
 
 private:
diff --git a/src/common/wincmn.cpp b/src/common/wincmn.cpp
index 453f9b90d5..8e3d5e4634 100644
--- a/src/common/wincmn.cpp
+++ b/src/common/wincmn.cpp
@@ -1451,7 +1451,7 @@ void wxWindowBase::GetPositionConstraint(int *x, int *y) const
 
 #endif // wxUSE_CONSTRAINTS
 
-void wxWindowBase::AdjustForParentClientOrigin(int& x, int& y, int sizeFlags)
+void wxWindowBase::AdjustForParentClientOrigin(int& x, int& y, int sizeFlags) const
 {
     // don't do it for the dialogs/frames - they float independently of their
     // parent