diff --git a/include/fmt/core.h b/include/fmt/core.h
index ee72cc01..679c95b7 100644
--- a/include/fmt/core.h
+++ b/include/fmt/core.h
@@ -300,6 +300,9 @@ FMT_GCC_PRAGMA("GCC optimize(\"Og\")")
 FMT_BEGIN_NAMESPACE
 FMT_MODULE_EXPORT_BEGIN
 
+// Alias for older systems where std::wstring isn't defined.
+using wstring = std::basic_string<wchar_t>;
+
 // Implementations of enable_if_t and other metafunctions for older systems.
 template <bool B, typename T = void>
 using enable_if_t = typename std::enable_if<B, T>::type;
diff --git a/include/fmt/format.h b/include/fmt/format.h
index 45af8c85..3efdfa4b 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -1232,7 +1232,7 @@ class utf8_to_utf16 {
   operator basic_string_view<wchar_t>() const { return {&buffer_[0], size()}; }
   auto size() const -> size_t { return buffer_.size() - 1; }
   auto c_str() const -> const wchar_t* { return &buffer_[0]; }
-  auto str() const -> std::wstring { return {&buffer_[0], size()}; }
+  auto str() const -> wstring { return {&buffer_[0], size()}; }
 };
 
 namespace dragonbox {
diff --git a/include/fmt/ostream.h b/include/fmt/ostream.h
index 30c04a2d..1c549bfd 100644
--- a/include/fmt/ostream.h
+++ b/include/fmt/ostream.h
@@ -138,9 +138,13 @@ void print(std::ostream& os, format_string<Args...> fmt, Args&&... args) {
   vprint(os, fmt, fmt::make_format_args(args...));
 }
 
+// Alias for older systems where std::wostream isn't defined.
+FMT_MODULE_EXPORT
+using wostream = std::basic_ostream<wchar_t>;
+
 FMT_MODULE_EXPORT
 template <typename... Args>
-void print(std::wostream& os,
+void print(wostream& os,
            basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
            Args&&... args) {
   vprint(os, fmt, fmt::make_format_args<buffer_context<wchar_t>>(args...));
diff --git a/include/fmt/xchar.h b/include/fmt/xchar.h
index 9b57815d..aa61b181 100644
--- a/include/fmt/xchar.h
+++ b/include/fmt/xchar.h
@@ -227,7 +227,7 @@ template <typename... T> void print(wformat_string<T...> fmt, T&&... args) {
 /**
   Converts *value* to ``std::wstring`` using the default format for type *T*.
  */
-template <typename T> inline auto to_wstring(const T& value) -> std::wstring {
+template <typename T> inline auto to_wstring(const T& value) -> wstring {
   return format(FMT_STRING(L"{}"), value);
 }
 FMT_MODULE_EXPORT_END