diff --git a/parse.y b/parse.y
index 19e5bb8a76..4c418d36b2 100644
--- a/parse.y
+++ b/parse.y
@@ -48,6 +48,7 @@
 # define YYFPRINTF(f, fmt, ...) rb_parser_printf(parser, fmt, ##__VA_ARGS__)
 #else
 # define YYFPRINTF		rb_parser_printf
+# undef stderr
 # define stderr 		parser
 #endif
 #undef malloc
diff --git a/tool/ytab.sed b/tool/ytab.sed
index d8fb70016c..c1700edbc0 100755
--- a/tool/ytab.sed
+++ b/tool/ytab.sed
@@ -47,6 +47,16 @@ a\
   }
   x
 }
+/^yy_symbol_value_print/{
+  a\
+#define yy_symbol_value_print(output, type, value, parser) yy_symbol_value_print(0, type, value, parser)
+}
+/^yy_symbol_print/{
+  a\
+#define yy_symbol_print(output, type, value, parser) yy_symbol_print(0, type, value, parser)
+  a\
+#define yyoutput parser
+}
 s/^\([ 	]*\)\(yyerror[ 	]*([ 	]*parser,\)/\1parser_\2/
 s!^ *extern char \*getenv();!/* & */!
 s/^\(#.*\)".*\.tab\.c"/\1"parse.c"/