From 865b86b058c7289b6594d4e64ab8cc4cc544de0e Mon Sep 17 00:00:00 2001
From: William Ledbetter <williamgledbetter@gmail.com>
Date: Mon, 31 Aug 2020 21:46:09 -0500
Subject: [PATCH] using

---
 test/test_autodiff_9.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/test_autodiff_9.cpp b/test/test_autodiff_9.cpp
index 62c7868518..e914962c1a 100644
--- a/test/test_autodiff_9.cpp
+++ b/test/test_autodiff_9.cpp
@@ -5,6 +5,8 @@
 
 BOOST_AUTO_TEST_SUITE(test_autodiff_9)
 
+using boost::math::differentiation::autodiff_v1::detail::fvar;
+
 BOOST_AUTO_TEST_CASE_TEMPLATE(eigen_init, T, all_float_types) {
   constexpr int size = 5;