1 files changed, 2 insertions, 1 deletions
diff --git a/parse.y b/parse.y
index bf73fb17a9..3338dcdaea 100644
--- a/parse.y
+++ b/parse.y
@@ -758,7 +758,8 @@ static void token_info_pop(struct parser_params*, const char *token, const rb_co
 static void token_info_warn(struct parser_params *p, const char *token, token_info *ptinfo_beg, int same, const rb_code_location_t *loc);
 %}
 
-%pure-parser
+%expect 0
+%define api.pure
 %lex-param {struct parser_params *p}
 %parse-param {struct parser_params *p}
 %initial-action