diff --git a/nntp/nntp.py b/nntp/nntp.py
index <HASH>..<HASH> 100644
--- a/nntp/nntp.py
+++ b/nntp/nntp.py
@@ -59,7 +59,7 @@ class NNTPReplyError(NNTPError):
         return self.args[1]
 
     def __str__(self):
-        return "%d: %s" % self.args
+        return "%d %s" % self.args
 
 class NNTPTemporaryError(NNTPReplyError):
     """NNTP temporary errors.
Changed __str__ for NNTPReplyError

It now matches the format of the original response i.e. theres no colon