diff --git a/ruby_parser.c b/ruby_parser.c
index b3617d5b5b3025..76dfa3b7be4203 100644
--- a/ruby_parser.c
+++ b/ruby_parser.c
@@ -483,7 +483,6 @@ static const rb_parser_config_t rb_global_parser_config = {
     .filesystem_str_new_cstr = rb_filesystem_str_new_cstr,
     .obj_as_string = rb_obj_as_string,
 
-    .num2int = rb_num2int_inline,
     .int2num = rb_int2num_inline,
 
     .stderr_tty_p = rb_stderr_tty_p,
diff --git a/rubyparser.h b/rubyparser.h
index 1705097f7ad3c8..f6fafa473fd87e 100644
--- a/rubyparser.h
+++ b/rubyparser.h
@@ -1310,7 +1310,6 @@ typedef struct rb_parser_config_struct {
     VALUE (*obj_as_string)(VALUE);
 
     /* Numeric */
-    int (*num2int)(VALUE val);
     VALUE (*int2num)(int v);
 
     /* IO */
diff --git a/universal_parser.c b/universal_parser.c
index 80a6f5d14beac3..b8b1cb9f846a48 100644
--- a/universal_parser.c
+++ b/universal_parser.c
@@ -156,8 +156,6 @@
 #define rb_filesystem_str_new_cstr        p->config->filesystem_str_new_cstr
 #define rb_obj_as_string                  p->config->obj_as_string
 
-#undef NUM2INT
-#define NUM2INT             p->config->num2int
 #undef INT2NUM
 #define INT2NUM             p->config->int2num