diff --git a/Lib/ftplib.py b/Lib/ftplib.py
index 1b16e0a..2cc4702 100644
--- a/Lib/ftplib.py
+++ b/Lib/ftplib.py
@@ -748,7 +748,9 @@
                 resp = self.voidcmd('AUTH TLS')
             else:
                 resp = self.voidcmd('AUTH SSL')
-            self.sock = self.context.wrap_socket(self.sock)
+            server_hostname = self.host if ssl.HAS_SNI else None
+            self.sock = self.context.wrap_socket(self.sock,
+                                                 server_hostname=server_hostname)
             self.file = self.sock.makefile(mode='r', encoding=self.encoding)
             return resp
 
@@ -787,7 +789,9 @@
         def ntransfercmd(self, cmd, rest=None):
             conn, size = FTP.ntransfercmd(self, cmd, rest)
             if self._prot_p:
-                conn = self.context.wrap_socket(conn)
+                server_hostname = self.host if ssl.HAS_SNI else None
+                conn = self.context.wrap_socket(conn,
+                                                server_hostname=server_hostname)
             return conn, size
 
         def abort(self):