diff --git a/external/parse.h b/external/parse.h
index 286c5bafc03e07..bbdae5f1acfe06 100644
--- a/external/parse.h
+++ b/external/parse.h
@@ -47,6 +47,13 @@ typedef struct rb_parser_config_struct {
     VALUE (*hash_lookup)(VALUE hash, VALUE key);
     VALUE (*ident_hash_new)(void);
 
+    /* Bignum */
+    void (*bignum_negate)(VALUE b);
+
+    /* Rational */
+    void (*rational_set_num)(VALUE r, VALUE n);
+    VALUE (*rational_get_num)(VALUE obj);
+
 
 } rb_parser_config_t;
 
diff --git a/parse.y b/parse.y
index 578c5824129bce..c2c81640931260 100644
--- a/parse.y
+++ b/parse.y
@@ -46,7 +46,6 @@ struct lex_context;
 #include "internal/error.h"
 #include "internal/imemo.h"
 #include "internal/io.h"
-#include "internal/rational.h"
 #include "internal/re.h"
 #include "internal/symbol.h"
 #include "internal/thread.h"
@@ -64,6 +63,7 @@ struct lex_context;
 #ifdef RIPPER
 #include "internal/numeric.h"
 #include "internal/hash.h"
+#include "internal/rational.h"
 #endif
 
 enum shareability {
@@ -131,6 +131,12 @@ RBIMPL_WARNING_POP()
 #define rb_hash_aset      p->config.hash_aset
 #define rb_hash_lookup    p->config.hash_lookup
 #define rb_ident_hash_new p->config.ident_hash_new
+
+#define bignum_negate p->config.bignum_negate
+
+#define rational_set_num p->config.rational_set_num
+#define rational_get_num p->config.rational_get_num
+
 #endif
 
 #define NO_LEX_CTXT (struct lex_context){0}
@@ -12541,11 +12547,11 @@ negate_lit(struct parser_params *p, VALUE lit)
     }
     switch (BUILTIN_TYPE(lit)) {
       case T_BIGNUM:
-        BIGNUM_NEGATE(lit);
+        bignum_negate(lit);
         lit = rb_big_norm(lit);
         break;
       case T_RATIONAL:
-        RATIONAL_SET_NUM(lit, negate_lit(p, RRATIONAL(lit)->num));
+        rational_set_num(lit, negate_lit(p, rational_get_num(lit)));
         break;
       case T_COMPLEX:
         RCOMPLEX_SET_REAL(lit, negate_lit(p, RCOMPLEX(lit)->real));
diff --git a/ruby_parser.c b/ruby_parser.c
index 9ab4d086528733..6d36ebfdb07477 100644
--- a/ruby_parser.c
+++ b/ruby_parser.c
@@ -1,8 +1,10 @@
 /* This is a wrapper for parse.y */
 
 #include "internal/array.h"
+#include "internal/bignum.h"
 #include "internal/hash.h"
 #include "internal/parse.h"
+#include "internal/rational.h"
 #include "internal/ruby_parser.h"
 
 #include "ruby/ruby.h"
@@ -45,6 +47,24 @@ static const rb_data_type_t ruby_parser_data_type = {
     0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };
 
+static void
+bignum_negate(VALUE b)
+{
+    BIGNUM_NEGATE(b);
+}
+
+static void
+rational_set_num(VALUE r, VALUE n)
+{
+    RATIONAL_SET_NUM(r, n);
+}
+
+static VALUE
+rational_get_num(VALUE obj)
+{
+    return RRATIONAL(obj)->num;
+}
+
 void
 rb_parser_config_initialize(rb_parser_config_t *config)
 {
@@ -84,6 +104,11 @@ rb_parser_config_initialize(rb_parser_config_t *config)
     config->hash_lookup    = rb_hash_lookup;
     config->ident_hash_new = rb_ident_hash_new;
 
+    config->bignum_negate = bignum_negate;
+
+    config->rational_set_num = rational_set_num;
+    config->rational_get_num = rational_get_num;
+
 }
 
 VALUE