diff --git a/README b/README
index a207716..f87a595 100644
--- a/README
+++ b/README
@@ -1,6 +1,6 @@
 gPass : global Password.
 
-Copyright (C) 2013 Grégory Soutadé
+Copyright (C) 2013-2014 Grégory Soutadé
 
 Licence : GPL v3
 
diff --git a/firefox_addon/lib/main.js b/firefox_addon/lib/main.js
index e08b7a1..6e4f607 100644
--- a/firefox_addon/lib/main.js
+++ b/firefox_addon/lib/main.js
@@ -165,7 +165,9 @@ function ask_server(field, logins, domain, wdomain, mkey, salt)
 		break;
 	    case "pkdbf2_level": 
 		server_pkdbf2_level = parseInt(params[1].match(/\d+/)[0], 10);
-		if (server_pkdbf2_level != NaN && server_pkdbf2_level != pkdbf2_level)
+		if (server_pkdbf2_level != NaN &&
+		    server_pkdbf2_level != pkdbf2_level &&
+		    server_pkdbf2_level >= 1000)
 		{
 		    debug("New pkdbf2 level " + server_pkdbf2_level);
 		    pkdbf2_level = server_pkdbf2_level;