diff --git a/unicodedomino.sty b/unicodedomino.sty
index ad980737adfecf45b12e1fd71d2cabd1506e3bce..acfb7ecde41c8473de079fe5e32b0e59483965a5 100644
--- a/unicodedomino.sty
+++ b/unicodedomino.sty
@@ -44,7 +44,9 @@
 \ifx\UTFviii@decode\@undefined%
  \input{unicodedomino_kernel_better_decode.def}%
 \fi%
-\input{unicodedomino_kernel_fixup_f4.def}%
+\ifx\UTFviii@hexcodepoint\@undefined%
+ \input{unicodedomino_kernel_fixup_f4.def}%
+\fi%
 \input{unicodedomino_kernel_cosmetics.def}%
 
 % retrieve the last octet