diff --git a/parse.y b/parse.y
index cdd64f7071aeff..4e66a79096f65c 100644
--- a/parse.y
+++ b/parse.y
@@ -13331,7 +13331,7 @@ count_char(const char *str, int c)
 RUBY_FUNC_EXPORTED size_t
 rb_yytnamerr(struct parser_params *p, char *yyres, const char *yystr)
 {
-    YYUSE(p);
+    YY_USE(p);
     if (*yystr == '"') {
 	size_t yyn = 0, bquote = 0;
 	const char *yyp = yystr;