diff --git a/include/wx/dfb/dc.h b/include/wx/dfb/dc.h
index 141224ba68..4dac548d98 100644
--- a/include/wx/dfb/dc.h
+++ b/include/wx/dfb/dc.h
@@ -157,8 +157,6 @@ private:
 protected:
     wxIDirectFBSurfacePtr m_surface;
 
-    double            m_mm_to_pix_x, m_mm_to_pix_y;
-
     friend class WXDLLIMPEXP_FWD_CORE wxOverlayImpl; // for Init
 
     wxDECLARE_ABSTRACT_CLASS(wxDFBDCImpl);
diff --git a/src/dfb/dc.cpp b/src/dfb/dc.cpp
index 241bcd0562..b718de4c98 100644
--- a/src/dfb/dc.cpp
+++ b/src/dfb/dc.cpp
@@ -51,11 +51,6 @@ void wxDFBDCImpl::DFBInit(const wxIDirectFBSurfacePtr& surface)
 
     wxCHECK_RET( surface != NULL, "invalid surface" );
 
-    m_mm_to_pix_x = (double)wxGetDisplaySize().GetWidth() /
-                    (double)wxGetDisplaySizeMM().GetWidth();
-    m_mm_to_pix_y = (double)wxGetDisplaySize().GetHeight() /
-                    (double)wxGetDisplaySizeMM().GetHeight();
-
     SetFont(DEFAULT_FONT);
     SetPen(DEFAULT_PEN);
     SetBrush(DEFAULT_BRUSH);