diff --git a/LDP/howto/linuxdoc/Lex-YACC-HOWTO.sgml b/LDP/howto/linuxdoc/Lex-YACC-HOWTO.sgml
index 985af4f8..7ebe13a0 100644
--- a/LDP/howto/linuxdoc/Lex-YACC-HOWTO.sgml
+++ b/LDP/howto/linuxdoc/Lex-YACC-HOWTO.sgml
@@ -932,7 +932,7 @@ target temperature 23
 What this calls for is for yylval to be a union, which can hold both strings
 and integers - but not simultaneously.
 
-Remember that we told YACC previously what type yylval was supposed to by by
+Remember that we told YACC previously what type yylval was supposed to be by
 defining YYSTYPE. We could conceivably define YYSTYPE to be a union this
 way, by YACC has an easier method for doing this: the %union statement.