diff --git a/include/characteristic/characteristic.hpp b/include/characteristic/characteristic.hpp
index d3fadc2..803f432 100644
--- a/include/characteristic/characteristic.hpp
+++ b/include/characteristic/characteristic.hpp
@@ -39,10 +39,10 @@ namespace character::characteristic {
 	};
 
 	void to_json(json &j, const Characteristic &charac) {
-		j.emplace("base", charac.get_base());
-		j.emplace("carac", charac.get_carac());
-		j.emplace("materiel", charac.get_materiel());
-		j.emplace("additional", charac.get_additional());
+		j["base"] = charac.get_base();
+		j["carac"] = charac.get_carac();
+		j["materiel"] = charac.get_materiel();
+		j["additional"] = charac.get_additional();
 	}
 }