diff --git a/unicodedomino.sty b/unicodedomino.sty
index f9937275f60db6f0d6a90ea8010ec317235e56f7..331e797954dda9881744db5017c6e4cce3648cb0 100644
--- a/unicodedomino.sty
+++ b/unicodedomino.sty
@@ -46,49 +46,6 @@
  \expandafter\UTFviii@hexnumber\expandafter{#1}%
 }%
 
-% missing in utf8.def 2014/09/29 v1.1m (Debian jessie)
-\ifx\decode@UTFviii\@undefined%
- \PackageWarning{unicodedomino}{Consider updating utf8.def}%
- % taken from utf8.def 2016/02/28 v1.1s (Debian sid), no claims on this code
- \gdef\decode@UTFviii#1\relax{%
-  \expandafter\UTFviii@cleanup\the\numexpr\dec@de@UTFviii#1\relax)))))\@empty%
- }%
- \gdef\UTFviii@cleanup#1)#2\@empty{#1}%
- \gdef\dec@de@UTFviii#1{%
-  \ifx\relax#1%
-  \else
-   \ifnum`#1>"EF
-    ((((`#1-"F0)%
-   \else
-    \ifnum`#1>"DF
-      (((`#1-"E0)%
-    \else
-     \ifnum`#1>"BF
-      ((`#1-"C0)%
-     \else
-      \ifnum`#1>"7F
-       )*64+(`#1-"80)%
-      \else
-       +`#1 %
-      \fi
-     \fi
-    \fi
-   \fi
-   \expandafter\dec@de@UTFviii
-  \fi%
- }%
- \gdef\UTFviii@hexnumber#1{%
-  \ifnum#1>15 %
-   \expandafter\UTFviii@hexnumber\expandafter{\the\numexpr(#1-8)/16\relax}%
-  \fi%
-  \UTFviii@hexdigit{\numexpr#1\ifnum#1>0-((#1-8)/16)*16\fi\relax}%
- }%
- \gdef\UTFviii@hexdigit#1{\ifcase\numexpr#1\relax%
-  0\or1\or2\or3\or4\or5\or6\or7\or8\or9\or A\or B\or C\or D\or E\or F\fi%
- }%
- % end of utf8.def inline update
-\fi%
-
 % override to beautify the output, not strictly necessary but requested
 \gdef\UTFviii@splitcsname#1:#2\relax{%
  #2 (\expandafter\unicodedomino@codepoint\expandafter{%