From b91805e1f0c6d82632a9a07cd13817f0626004ef Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Mon, 2 Oct 2017 18:11:36 +0200
Subject: [PATCH] :rotating_light: removing a compiler warning #755

---
 src/json.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/json.hpp b/src/json.hpp
index b781b98c6..b15470b6d 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -6660,7 +6660,7 @@ class serializer
             return;
         }
 
-        const bool is_negative = x < 0;
+        const bool is_negative = std::is_same<NumberType, number_integer_t>::value and (x < 0);
         std::size_t i = 0;
 
         // spare 1 byte for '\0'