diff --git a/interface/wx/window.h b/interface/wx/window.h
index dd36e63c25..acf13d5918 100644
--- a/interface/wx/window.h
+++ b/interface/wx/window.h
@@ -1103,6 +1103,14 @@ public:
     */
     virtual wxSize GetBestVirtualSize() const;
 
+    /**
+       Returns the magnification of the backing store of this window, eg 2.0
+       for a window on a retina screen.
+
+       @since 2.9.5
+    */
+    virtual double GetMagnificationFactor() const;
+    
     /**
         Returns the size of the left/right and top/bottom borders of this window in x
         and y components of the result respectively.