diff --git a/default.texinfo b/default.texinfo
index 9c1d8e178..458d4fdda 100644
--- a/default.texinfo
+++ b/default.texinfo
@@ -1,5 +1,5 @@
 \input texinfo
-@documentencoding utf-8
+@documentencoding UTF-8
 $for(header-includes)$
 $header-includes$
 $endfor$