diff --git a/include/fmt/base.h b/include/fmt/base.h
index f91f8e82..84b175c3 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -2382,11 +2382,6 @@ template <typename T> class basic_appender {
   detail::buffer<T>* container;
 
  public:
-  using iterator_category = int;
-  using value_type = T;
-  using pointer = T*;
-  using reference = T&;
-  using difference_type = decltype(pointer() - pointer());
   using container_type = detail::buffer<T>;
 
   FMT_CONSTEXPR basic_appender(detail::buffer<T>& buf) : container(&buf) {}
diff --git a/include/fmt/format.h b/include/fmt/format.h
index 52af87b8..4892d682 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -119,11 +119,13 @@
 #endif
 
 namespace std {
-template <> struct iterator_traits<fmt::appender> {
+template <class T> struct iterator_traits<fmt::basic_appender<T>> {
   using iterator_category = output_iterator_tag;
-  using value_type = char;
-  using reference = char&;
-  using difference_type = fmt::appender::difference_type;
+  using value_type = T;
+  using difference_type =
+      decltype(static_cast<int*>(nullptr) - static_cast<int*>(nullptr));
+  using pointer = void;
+  using reference = void;
 };
 }  // namespace std