diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index 8e4d49c859534d..72512fe569c178 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -1424,7 +1424,7 @@ def ipv6_mapped(self):
             The IPv4-mapped IPv6 address per RFC 4291.
 
         """
-        return IPv6Address(f'::ffff:{self}')
+        return IPv6Address((0xFFFF << 32) + self._ip)
 
 
 class IPv4Interface(IPv4Address):