diff --git a/Lib/telnetlib.py b/Lib/telnetlib.py
index 14ca1b19041..d49d4f41aff 100644
--- a/Lib/telnetlib.py
+++ b/Lib/telnetlib.py
@@ -315,7 +315,8 @@ class Telnet:
             poller.register(self, poll_in_or_priority_flags)
             while i < 0 and not self.eof:
                 try:
-                    ready = poller.poll(call_timeout)
+                    ready = poller.poll(None if timeout is None
+                                        else 1000 * call_timeout)
                 except select.error as e:
                     if e.errno == errno.EINTR:
                         if timeout is not None:
@@ -683,7 +684,8 @@ class Telnet:
             poller.register(self, poll_in_or_priority_flags)
             while not m and not self.eof:
                 try:
-                    ready = poller.poll(call_timeout)
+                    ready = poller.poll(None if timeout is None
+                                        else 1000 * call_timeout)
                 except select.error as e:
                     if e.errno == errno.EINTR:
                         if timeout is not None:
diff --git a/Misc/NEWS b/Misc/NEWS
index 5a94af38367..b6837f7dc50 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -20,6 +20,11 @@ Core and Builtins
 Library
 -------
 
+- Issue #17200: telnetlib's read_until and expect timeout was broken by the
+  fix to Issue #14635 in Python 3.3.0 to be interpreted as milliseconds
+  instead of seconds when the platform supports select.poll (ie: everywhere).
+  It is now treated as seconds once again.
+
 - Issue #17429: platform.linux_distribution() now decodes files from the UTF-8
   encoding with the surrogateescape error handler, instead of decoding from the
   locale encoding in strict mode. It fixes the function on Fedora 19 which is