diff --git a/include/wx/os2/mdi.h b/include/wx/os2/mdi.h
index 83de722b34..ba390372c1 100644
--- a/include/wx/os2/mdi.h
+++ b/include/wx/os2/mdi.h
@@ -102,8 +102,6 @@ protected:
     bool m_parentFrameActive;
 
 private:
-    friend class WXDLLEXPORT wxMDIChildFrame;
-
     DECLARE_EVENT_TABLE()
 };