diff --git a/VERSION b/VERSION
index de9b9614..f669d738 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.5.1-stable+timestamp.2013.06.23.08.47.09
+Version 2.5.1-stable+timestamp.2013.06.23.08.49.34
diff --git a/gluon/dal.py b/gluon/dal.py
index f625e09c..aeb7708d 100644
--- a/gluon/dal.py
+++ b/gluon/dal.py
@@ -6186,7 +6186,7 @@ class IMAPAdapter(NoSQLAdapter):
                             Field("mime", "string", writable=False),
                             Field("email", "string", writable=False, readable=False),
                             Field("attachments", list, writable=False, readable=False),
-                            Field("encoding")
+                            Field("encoding", writable=False)
                             )
 
             # Set a special _mailbox attribute for storing