diff --git a/tool/ytab.sed b/tool/ytab.sed
index ba7566ac7f..ac7e97107d 100755
--- a/tool/ytab.sed
+++ b/tool/ytab.sed
@@ -68,7 +68,7 @@ a\
   s/fprintf *(stderr,/YYFPRINTF (p,/g
 }
 s/^yysyntax_error (/&struct parser_params *p, /
-s/ yysyntax_error (/&p, /
+s/YYSYNTAX_ERROR yysyntax_error (/&p, /
 s/\( YYFPRINTF *(\)yyoutput,/\1p,/
 s/\( YYFPRINTF *(\)yyo,/\1p,/
 s/\( YYFPRINTF *(\)stderr,/\1p,/