From 70b7455a139b57df884e46da3c7ed778cd762acd Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Mon, 19 Jun 2017 21:50:36 +0200
Subject: [PATCH] :hammer: minor change

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

diff --git a/src/json.hpp b/src/json.hpp
index 146b52867..b4dc422d8 100644
--- a/src/json.hpp
+++ b/src/json.hpp
@@ -12529,7 +12529,7 @@ scan_number_done:
         }
 
         /// return syntax error message
-        const char* get_error_message() const noexcept
+        constexpr const char* get_error_message() const noexcept
         {
             return error_message;
         }