diff --git a/util/sasl.lua b/util/sasl.lua
index 7f023321c..11a25f3af 100644
--- a/util/sasl.lua
+++ b/util/sasl.lua
@@ -205,6 +205,7 @@ local function new_digest_md5(realm, password_handler)
 			local A1 = "";
 			if response.authzid then
 				if response.authzid == self.username.."@"..self.realm then
+					-- COMPAT
 					log("warn", "Client is violating XMPP RFC. See section 6.1 of RFC 3920.");
 					A1 = Y..":"..response["nonce"]..":"..response["cnonce"]..":"..response.authzid;
 				else