diff --git a/builtin.c b/builtin.c
index d0d998da49..5ad7f23d5a 100644
--- a/builtin.c
+++ b/builtin.c
@@ -41,11 +41,3 @@ Init_builtin(void)
 {
     //
 }
-
-// inline
-VALUE
-rb_vm_lvar_exposed(rb_execution_context_t *ec, int index)
-{
-    const rb_control_frame_t *cfp = ec->cfp;
-    return cfp->ep[index];
-}
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 205b4d915f..e5a7c77e91 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -4995,3 +4995,12 @@ vm_invoke_builtin_delegate(rb_execution_context_t *ec, rb_control_frame_t *cfp,
     // fprintf(stderr, "%s %s(%d):%p\n", __func__, bf->name, bf->argc, bf->func_ptr);
     return invoke_bf(ec, cfp, bf, argv);
 }
+
+// for __builtin_inline!()
+
+VALUE
+rb_vm_lvar_exposed(rb_execution_context_t *ec, int index)
+{
+    const rb_control_frame_t *cfp = ec->cfp;
+    return cfp->ep[index];
+}