From 13242f76ccd3a38a110d302da8789de70ce719ce Mon Sep 17 00:00:00 2001
From: Niels Lohmann <mail@nlohmann.me>
Date: Wed, 8 Jul 2026 20:20:54 +0200
Subject: [PATCH] :rotating_light: fix warning

Signed-off-by: Niels Lohmann <mail@nlohmann.me>
---
 tests/src/unit-conversions.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/src/unit-conversions.cpp b/tests/src/unit-conversions.cpp
index b3ab6a8f1..ad6623401 100644
--- a/tests/src/unit-conversions.cpp
+++ b/tests/src/unit-conversions.cpp
@@ -1765,8 +1765,8 @@ TEST_CASE("std::optional")
 {
     SECTION("null")
     {
-        json j_null;
-        std::optional<std::string> opt_null;
+        const json j_null;
+        const std::optional<std::string> opt_null;
 
         CHECK(json(opt_null) == j_null);
         CHECK(j_null.get<std::optional<std::string>>() == std::nullopt);