diff --git a/include/nlohmann/detail/input/json_sax.hpp b/include/nlohmann/detail/input/json_sax.hpp
index 80850ab92..fc9e9b774 100644
--- a/include/nlohmann/detail/input/json_sax.hpp
+++ b/include/nlohmann/detail/input/json_sax.hpp
@@ -904,7 +904,8 @@ class json_sax_dom_parser : public json_sax_dom_error_state
             {
                 hashes.push_back(hasher(element.first));
             }
-            ordered_data.key_indexes.emplace_back(new object_key_index(std::move(hashes)));
+            std::unique_ptr<object_key_index> index(new object_key_index(std::move(hashes))); // NOLINT(cppcoreguidelines-owning-memory,modernize-make-unique): std::make_unique is C++14
+            ordered_data.key_indexes.push_back(std::move(index));
             f.ordered.index = ordered_data.key_indexes.back().get();
         }
 
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index bb81909ae..50089514f 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -16538,7 +16538,8 @@ class json_sax_dom_parser : public json_sax_dom_error_state
             {
                 hashes.push_back(hasher(element.first));
             }
-            ordered_data.key_indexes.emplace_back(new object_key_index(std::move(hashes)));
+            std::unique_ptr<object_key_index> index(new object_key_index(std::move(hashes))); // NOLINT(cppcoreguidelines-owning-memory,modernize-make-unique): std::make_unique is C++14
+            ordered_data.key_indexes.push_back(std::move(index));
             f.ordered.index = ordered_data.key_indexes.back().get();
         }