From 3df06683145ba396bcc8fd66c2f7c4f7568d33d6 Mon Sep 17 00:00:00 2001
From: Alexander Grund <git@grundis.de>
Date: Tue, 14 Apr 2020 10:44:36 +0200
Subject: [PATCH] Fix unknown preproccessor symbol warning

---
 include/turtle/constraint.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/turtle/constraint.hpp b/include/turtle/constraint.hpp
index 25aa160..887a22d 100644
--- a/include/turtle/constraint.hpp
+++ b/include/turtle/constraint.hpp
@@ -223,7 +223,7 @@ namespace detail
 
 #ifdef MOCK_VARIADIC_MACROS
 
-#if BOOST_MSVC
+#ifdef BOOST_MSVC
 #   define MOCK_VARIADIC_SIZE(...) \
         BOOST_PP_CAT(MOCK_VARIADIC_SIZE_I(__VA_ARGS__, \
             32, 31, 30, 29, 28, 27, 26, 25, 24, 23, \