diff --git a/universal_parser.c b/universal_parser.c
index e6822c1bdc..d555ea00e8 100644
--- a/universal_parser.c
+++ b/universal_parser.c
@@ -252,8 +252,5 @@
 #define rb_enc_isascii p->config->enc_isascii
 #define rb_enc_mbc_to_codepoint p->config->enc_mbc_to_codepoint
 
-#undef st_init_table_with_size
-#define st_init_table_with_size rb_parser_st_init_table_with_size
-
 #define rb_ast_new() \
     rb_ast_new(p->config)