diff --git a/include/wx/sizer.h b/include/wx/sizer.h
index 90d07ae3e7..80114a4abf 100644
--- a/include/wx/sizer.h
+++ b/include/wx/sizer.h
@@ -374,7 +374,7 @@ public:
     float GetRatio() const
         { return m_ratio; }
 
-    virtual wxRect GetRect() { return m_rect; }
+    virtual wxRect GetRect() const { return m_rect; }
 
     // set a sizer item id (different from a window id, all sizer items,
     // including spacers, can have an associated id)
diff --git a/interface/wx/sizer.h b/interface/wx/sizer.h
index 2f5b3664ad..255c784383 100644
--- a/interface/wx/sizer.h
+++ b/interface/wx/sizer.h
@@ -1306,7 +1306,7 @@ public:
     /**
         Get the rectangle of the item on the parent window, excluding borders.
     */
-    virtual wxRect GetRect();
+    virtual wxRect GetRect() const;
 
     /**
         Get the current size of the item, as set in the last Layout.