diff --git a/ChangeLog b/ChangeLog
index f8f2bd5..7f91840 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2013-01-20  Niibe Yutaka  <gniibe@fsij.org>
+
+	* tool/gpg_agent.py: New.
+
 2013-01-11  Niibe Yutaka  <gniibe@fsij.org>
 
 	* tool/pinpadtest.py: Add fixed length input.
diff --git a/tool/gpg_agent.py b/tool/gpg_agent.py
index a8440f3..8a35ccb 100644
--- a/tool/gpg_agent.py
+++ b/tool/gpg_agent.py
@@ -36,7 +36,7 @@ class gpg_agent(object):
         else:
             chunk = self.sock.recv(BUFLEN)
         while True:
-            pos = chunk.index('\n')
+            pos = chunk.find('\n')
             if pos >= 0:
                 self.buf_remained = chunk[pos+1:]
                 line = line + chunk[0:pos]