diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 65c9e841a..1f2819163 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -21370,7 +21370,7 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
         auto it = m_data.m_value.object->find(std::forward<KeyType>(key));
         if (it == m_data.m_value.object->end())
         {
-            JSON_THROW(out_of_range::create(403, detail::concat("key '", string_t(std::forward<KeyType>(key)), "' not found"), this));
+            JSON_THROW(out_of_range::create(403, "key not found (key is an rvalue and cannot be shown)", this));
         }
         return it->second;
     }