diff --git a/include/wx/bmpcbox.h b/include/wx/bmpcbox.h
index fb10613640..b625e122b3 100644
--- a/include/wx/bmpcbox.h
+++ b/include/wx/bmpcbox.h
@@ -21,6 +21,9 @@
 
 class WXDLLIMPEXP_FWD_CORE wxWindow;
 class WXDLLIMPEXP_FWD_CORE wxItemContainer;
+#if defined(wxBITMAPCOMBOBOX_OWNERDRAWN_BASED)
+class WXDLLIMPEXP_FWD_CORE wxDC;
+#endif
 
 // Define wxBITMAPCOMBOBOX_OWNERDRAWN_BASED for platforms which
 // wxBitmapComboBox implementation utilizes ownerdrawn combobox