diff --git a/paramiko/sftp_client.py b/paramiko/sftp_client.py
index ce6fbec..1caaf16 100644
--- a/paramiko/sftp_client.py
+++ b/paramiko/sftp_client.py
@@ -117,8 +117,10 @@ class SFTPClient(BaseSFTP):
     def _log(self, level, msg, *args):
         if isinstance(msg, list):
             for m in msg:
-                super(SFTPClient, self)._log(level, "[chan %s] " + m, *([self.sock.get_name()] + list(args)))
+                self._log(level, m, *args)
         else:
+            # escape '%' in msg (they could come from file or directory names) before logging
+            msg = msg.replace('%','%%')
             super(SFTPClient, self)._log(level, "[chan %s] " + msg, *([self.sock.get_name()] + list(args)))
 
     def close(self):
diff --git a/sites/www/changelog.rst b/sites/www/changelog.rst
index cedc44f..16f3bb1 100644
--- a/sites/www/changelog.rst
+++ b/sites/www/changelog.rst
@@ -2,6 +2,8 @@
 Changelog
 =========
 
+* :bug:`-` Fix logging error in sftp_client for filenames containing the '%'
+  character. Thanks to Antoine Brenner.
 * :bug:`308` Fix regression in dsskey.py that caused sporadic signature 
   verification failures. Thanks to Chris Rose.
 * :support:`299` Use deterministic signatures for ECDSA keys for improved
diff --git a/tests/test_sftp.py b/tests/test_sftp.py
index 6417ac9..e0534eb 100755
--- a/tests/test_sftp.py
+++ b/tests/test_sftp.py
@@ -37,6 +37,7 @@ from paramiko.common import o777, o600, o666, o644
 from tests.stub_sftp import StubServer, StubSFTPServer
 from tests.loop import LoopSocket
 from tests.util import test_path
+import paramiko.util
 from paramiko.sftp_attr import SFTPAttributes
 
 ARTICLE = '''
@@ -732,7 +733,23 @@ class SFTPTest (unittest.TestCase):
             sftp.remove(target)
 
 
+    def test_N_file_with_percent(self):
+        """
+        verify that we can create a file with a '%' in the filename.
+        ( it needs to be properly escaped by _log() )
+        """
+        self.assertTrue( paramiko.util.get_logger("paramiko").handlers, "This unit test requires logging to be enabled" )
+        f = sftp.open(FOLDER + '/test%file', 'w')
+        try:
+            self.assertEqual(f.stat().st_size, 0)
+        finally:
+            f.close()
+            sftp.remove(FOLDER + '/test%file')
+
+
 if __name__ == '__main__':
     SFTPTest.init_loopback()
+    # logging is required by test_N_file_with_percent
+    paramiko.util.log_to_file('test_sftp.log')
     from unittest import main
     main()