diff --git a/include/wx/msw/ole/dataform.h b/include/wx/msw/ole/dataform.h
index b86ac09bb3..af239eb3ec 100644
--- a/include/wx/msw/ole/dataform.h
+++ b/include/wx/msw/ole/dataform.h
@@ -27,7 +27,9 @@ public:
     // wxString don't apply when we already rely on implicit conversion of a,
     // for example, "char *" string to wxDataFormat, and existing code does it
     wxDataFormat(const wxString& format) { SetId(format); }
+#ifndef wxNO_IMPLICIT_WXSTRING_ENCODING
     wxDataFormat(const char *format) { SetId(format); }
+#endif // wxNO_IMPLICIT_WXSTRING_ENCODING
     wxDataFormat(const wchar_t *format) { SetId(format); }
     wxDataFormat(const wxCStrData& format) { SetId(format); }