3 files changed, 11 insertions, 6 deletions
diff --git a/parse.y b/parse.y
index da66c5637a..de3a8a8183 100644
--- a/parse.y
+++ b/parse.y
@@ -10925,12 +10925,14 @@ mark_lvar_used(struct parser_params *p, NODE *rhs)
     }
 }
 
+extern VALUE rb_mRubyVMFrozenCore;
+
 static NODE *
 shareable_constant_value(struct parser_params *p, NODE *value, const YYLTYPE *loc)
 {
     if (p->ctxt.shareable_constant_value) {
-	NODE *ractor = NEW_COLON3(rb_intern("Ractor"), loc);
-	value = NEW_CALL(ractor, rb_intern("make_shareable"),
+	NODE *fcore = NEW_LIT(rb_mRubyVMFrozenCore, loc);
+	value = NEW_CALL(fcore, rb_intern("make_shareable"),
 			NEW_LIST(value, loc), loc);
     }
     return value;
diff --git a/ractor.rb b/ractor.rb
index 0867f1a9d1..ca09aee7be 100644
--- a/ractor.rb
+++ b/ractor.rb
@@ -51,10 +51,6 @@ class Ractor
     }
   end
 
-  def self.make_shareable(obj)
-    obj.freeze
-  end
-
   # Multiplex multiple Ractor communications.
   #
   #   r, obj = Ractor.select(r1, r2)
diff --git a/vm.c b/vm.c
index c6f3344130..8ced733d5f 100644
--- a/vm.c
+++ b/vm.c
@@ -3177,6 +3177,12 @@ m_core_hash_merge_kwd(VALUE recv, VALUE hash, VALUE kw)
 }
 
 static VALUE
+m_core_make_shareable(VALUE recv, VALUE obj)
+{
+    return rb_obj_freeze(obj);
+}
+
+static VALUE
 core_hash_merge_kwd(VALUE hash, VALUE kw)
 {
     rb_hash_foreach(rb_to_hash_type(kw), kwmerge_i, hash);
@@ -3340,6 +3346,7 @@ Init_VM(void)
     rb_define_method_id(klass, id_core_raise, f_raise, -1);
     rb_define_method_id(klass, idProc, f_proc, 0);
     rb_define_method_id(klass, idLambda, f_lambda, 0);
+    rb_define_method(klass, "make_shareable", m_core_make_shareable, 1);
     rb_obj_freeze(fcore);
     RBASIC_CLEAR_CLASS(klass);
     rb_obj_freeze(klass);