diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index 500fcddf2..ac8c9d26c 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -174,18 +174,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     }
 
   private:
-    using primitive_iterator_t = ::nlohmann::detail::primitive_iterator_t;
-    template<typename BasicJsonType>
-    using internal_iterator = ::nlohmann::detail::internal_iterator<BasicJsonType>;
     template<typename BasicJsonType>
     using iter_impl = ::nlohmann::detail::iter_impl<BasicJsonType>;
     template<typename Iterator>
     using iteration_proxy = ::nlohmann::detail::iteration_proxy<Iterator>;
     template<typename Base> using json_reverse_iterator = ::nlohmann::detail::json_reverse_iterator<Base>;
 
-    template<typename CharType>
-    using output_adapter_t = ::nlohmann::detail::output_adapter_t<CharType>;
-
     template<typename InputType>
     using binary_reader = ::nlohmann::detail::binary_reader<basic_json, InputType>;
     template<typename CharType> using binary_writer = ::nlohmann::detail::binary_writer<basic_json, CharType>;
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 576498738..d1b85fcfa 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -26255,18 +26255,12 @@ class basic_json // NOLINT(cppcoreguidelines-special-member-functions,hicpp-spec
     }
 
   private:
-    using primitive_iterator_t = ::nlohmann::detail::primitive_iterator_t;
-    template<typename BasicJsonType>
-    using internal_iterator = ::nlohmann::detail::internal_iterator<BasicJsonType>;
     template<typename BasicJsonType>
     using iter_impl = ::nlohmann::detail::iter_impl<BasicJsonType>;
     template<typename Iterator>
     using iteration_proxy = ::nlohmann::detail::iteration_proxy<Iterator>;
     template<typename Base> using json_reverse_iterator = ::nlohmann::detail::json_reverse_iterator<Base>;
 
-    template<typename CharType>
-    using output_adapter_t = ::nlohmann::detail::output_adapter_t<CharType>;
-
     template<typename InputType>
     using binary_reader = ::nlohmann::detail::binary_reader<basic_json, InputType>;
     template<typename CharType> using binary_writer = ::nlohmann::detail::binary_writer<basic_json, CharType>;