diff --git a/lisp/language/cyrillic.el b/lisp/language/cyrillic.el
index 9ad65877140..cf3ee5a2b9d 100644
--- a/lisp/language/cyrillic.el
+++ b/lisp/language/cyrillic.el
@@ -127,7 +127,7 @@ Support for Russian using koi8-r and the russian-computer input method.")
   "KOI8-U 8-bit encoding for Cyrillic (MIME: KOI8-U)"
   :coding-type 'charset
   ;; This used to be ?U which collided with UTF-8.
-  :mnemonic ?\u0423                 ; ?\N{cyrillic capital letter u} У
+  :mnemonic ?У
   :charset-list '(koi8-u)
   :mime-charset 'koi8-u)