diff --git a/src/emqx_reason_codes.erl b/src/emqx_reason_codes.erl
index f4b3e4aac..b8a9b9e4b 100644
--- a/src/emqx_reason_codes.erl
+++ b/src/emqx_reason_codes.erl
@@ -150,6 +150,7 @@ compat(unsuback, _Code) -> undefined.
 
 connack_error(client_identifier_not_valid) -> ?RC_CLIENT_IDENTIFIER_NOT_VALID;
 connack_error(bad_username_or_password) -> ?RC_BAD_USER_NAME_OR_PASSWORD;
+connack_error(bad_clientid_or_password) -> ?RC_BAD_USER_NAME_OR_PASSWORD;
 connack_error(username_or_password_undefined) -> ?RC_BAD_USER_NAME_OR_PASSWORD;
 connack_error(password_error) -> ?RC_BAD_USER_NAME_OR_PASSWORD;
 connack_error(not_authorized) -> ?RC_NOT_AUTHORIZED;
diff --git a/src/emqx_types.erl b/src/emqx_types.erl
index 57ce4b326..7f6b019fe 100644
--- a/src/emqx_types.erl
+++ b/src/emqx_types.erl
@@ -72,6 +72,7 @@
 -type(auth_result() :: success
                      | client_identifier_not_valid
                      | bad_username_or_password
+                     | bad_clientid_or_password
                      | not_authorized
                      | server_unavailable
                      | server_busy