diff --git a/include/wx/chkconf.h b/include/wx/chkconf.h
index c29f9bff30..a9a252e60a 100644
--- a/include/wx/chkconf.h
+++ b/include/wx/chkconf.h
@@ -533,6 +533,22 @@
 #   endif
 #endif /* !defined(wxUSE_WXHTML_HELP) */
 
+#ifndef wxUSE_UNICODE
+#   ifdef wxABORT_ON_CONFIG_ERROR
+#       error "wxUSE_UNICODE must be defined."
+#   else
+#       define wxUSE_UNICODE 0
+#   endif
+#endif /* !defined(wxUSE_UNICODE) */
+
+#if defined(__WXMSW__) && !defined(wxUSE_UNICODE_MSLU)
+#   ifdef wxABORT_ON_CONFIG_ERROR
+#       error "wxUSE_UNICODE_MSLU must be defined."
+#   else
+#       define wxUSE_UNICODE_MSLU 0
+#   endif
+#endif /* !defined(wxUSE_UNICODE) */
+
 /*
    check consistency of the settings
  */
@@ -877,5 +893,14 @@
 #   endif
 #endif /* wxUSE_CLIPBOARD */
 
+#if wxUSE_UNICODE_MSLU && !wxUSE_UNICODE
+#   ifdef wxABORT_ON_CONFIG_ERROR
+#       error "wxUSE_UNICODE_MSLU requires wxUSE_UNICODE"
+#   else
+#       undef wxUSE_UNICODE
+#       define wxUSE_UNICODE 1
+#   endif
+#endif /* wxUSE_UNICODE_MSLU */
+
 #endif /* wxUSE_GUI */