diff --git a/test/extended_euclidean_test.cpp b/test/extended_euclidean_test.cpp
index 91b2533..2978083 100644
--- a/test/extended_euclidean_test.cpp
+++ b/test/extended_euclidean_test.cpp
@@ -4,6 +4,7 @@
  *  Boost Software License, Version 1.0. (See accompanying file
  *  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
+#include <boost/config.hpp>
 #if (defined(BOOST_MSVC) && (BOOST_MSVC < 1500)) || \
      (defined(__clang_major__) && (__clang_major__ == 3) && (__clang_minor__ < 2)) || \
      (defined(BOOST_GCC) && defined(BOOST_GCC_CXX11) && BOOST_GCC < 40800)
diff --git a/test/mod_inverse_test.cpp b/test/mod_inverse_test.cpp
index a69f750..793c5c1 100644
--- a/test/mod_inverse_test.cpp
+++ b/test/mod_inverse_test.cpp
@@ -4,9 +4,10 @@
  *  Boost Software License, Version 1.0. (See accompanying file
  *  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  */
+#include <boost/config.hpp>
 #if (defined(BOOST_MSVC) && (BOOST_MSVC < 1500)) || \
       (defined(__clang_major__) && (__clang_major__ == 3) && (__clang_minor__ < 2)) || \
-      (defined(BOOST_GCC) && defined(BOOST_GCC_CXX11) && BOOST_GCC < 50000)
+      (defined(BOOST_GCC) && defined(BOOST_GCC_CXX11) && BOOST_GCC < 40800)
 #define DISABLE_MP_TESTS
 #endif