diff --git a/Lib/ftplib.py b/Lib/ftplib.py
index 222e77d..c0cfe27 100644
--- a/Lib/ftplib.py
+++ b/Lib/ftplib.py
@@ -234,7 +234,7 @@
         if self.debugging > 1: print '*put urgent*', self.sanitize(line)
         self.sock.sendall(line, MSG_OOB)
         resp = self.getmultiline()
-        if resp[:3] not in ('426', '226'):
+        if resp[:3] not in ('426', '225', '226'):
             raise error_proto, resp
 
     def sendcmd(self, cmd):
diff --git a/Misc/NEWS b/Misc/NEWS
index a4ee20e..6482c03 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and Builtins
 -----------------
 
+- Issue #3817: ftplib.FTP.abort() method now considers 225 a valid response
+  code as stated in RFC-959 at chapter 5.4.
+
 - Issue #8417: Raise an OverflowError when an integer larger than sys.maxsize is
   passed to bytearray.