diff --git a/doc/bison.texi b/doc/bison.texi
index c3099cfc..72f28fc2 100644
--- a/doc/bison.texi
+++ b/doc/bison.texi
@@ -11821,12 +11821,6 @@ then the parser's to get the set of defined tokens.
 @comment file: calc++/scanner.ll
 @example
 %@{
-// Work around an incompatibility in flex (at least versions 2.5.31 through
-// 2.5.33): it generates code that does not conform to C89.  See Debian bug
-// 333231 <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.
-# undef yywrap
-# define yywrap() 1
-
 // Pacify warnings in yy_init_buffer (observed with Flex 2.6.4)
 // and GCC 6.4.0, 7.3.0.
 #if defined __GNUC__ && !defined __clang__ && 6 <= __GNUC__