diff --git a/libcxx/include/chrono b/libcxx/include/chrono
--- a/libcxx/include/chrono
+++ b/libcxx/include/chrono
@@ -697,38 +697,38 @@
                   const zoned_time<Duration2, TimeZonePtr>& y);
 
 // 25.10.8, leap second support    // C++20
-class leap;
+class leap_second;
 
-bool operator==(const leap& x, const leap& y);
-bool operator!=(const leap& x, const leap& y);
-bool operator< (const leap& x, const leap& y);
-bool operator> (const leap& x, const leap& y);
-bool operator<=(const leap& x, const leap& y);
-bool operator>=(const leap& x, const leap& y);
+bool operator==(const leap_second& x, const leap_second& y);
+bool operator!=(const leap_second& x, const leap_second& y);
+bool operator< (const leap_second& x, const leap_second& y);
+bool operator> (const leap_second& x, const leap_second& y);
+bool operator<=(const leap_second& x, const leap_second& y);
+bool operator>=(const leap_second& x, const leap_second& y);
 template<class Duration>
-  bool operator==(const leap& x, const sys_time<Duration>& y);
+  bool operator==(const leap_second& x, const sys_time<Duration>& y);
 template<class Duration>
-  bool operator==(const sys_time<Duration>& x, const leap& y);
+  bool operator==(const sys_time<Duration>& x, const leap_second& y);
 template<class Duration>
-  bool operator!=(const leap& x, const sys_time<Duration>& y);
+  bool operator!=(const leap_second& x, const sys_time<Duration>& y);
 template<class Duration>
-  bool operator!=(const sys_time<Duration>& x, const leap& y);
+  bool operator!=(const sys_time<Duration>& x, const leap_second& y);
 template<class Duration>
-  bool operator< (const leap& x, const sys_time<Duration>& y);
+  bool operator< (const leap_second& x, const sys_time<Duration>& y);
 template<class Duration>
-  bool operator< (const sys_time<Duration>& x, const leap& y);
+  bool operator< (const sys_time<Duration>& x, const leap_second& y);
 template<class Duration>
-  bool operator> (const leap& x, const sys_time<Duration>& y);
+  bool operator> (const leap_second& x, const sys_time<Duration>& y);
 template<class Duration>
-  bool operator> (const sys_time<Duration>& x, const leap& y);
+  bool operator> (const sys_time<Duration>& x, const leap_second& y);
 template<class Duration>
-  bool operator<=(const leap& x, const sys_time<Duration>& y);
+  bool operator<=(const leap_second& x, const sys_time<Duration>& y);
 template<class Duration>
-  bool operator<=(const sys_time<Duration>& x, const leap& y);
+  bool operator<=(const sys_time<Duration>& x, const leap_second& y);
 template<class Duration>
-  bool operator>=(const leap& x, const sys_time<Duration>& y);
+  bool operator>=(const leap_second& x, const sys_time<Duration>& y);
 template<class Duration>
-  bool operator>=(const sys_time<Duration>& x, const leap& y);
+  bool operator>=(const sys_time<Duration>& x, const leap_second& y);
 
 // 25.10.9, class link    // C++20
 class link;