diff --git a/apps/emqx_bridge_mqtt/priv/emqx_bridge_mqtt.schema b/apps/emqx_bridge_mqtt/priv/emqx_bridge_mqtt.schema
index 30120a7d5..face6277e 100644
--- a/apps/emqx_bridge_mqtt/priv/emqx_bridge_mqtt.schema
+++ b/apps/emqx_bridge_mqtt/priv/emqx_bridge_mqtt.schema
@@ -183,8 +183,12 @@
                     [{verify, verify_peer}];
                (verify, false) ->
                     [{verify, verify_none}];
-               (server_name_indication, "disabled") ->
-                    [{server_name_indication, disabled}];
+               (server_name_indication, "disable") ->
+                    [{server_name_indication, disable}];
+               (server_name_indication, undefined) ->
+                    [];
+               (server_name_indication, "") ->
+                    [];
                (server_name_indication, Hostname) ->
                     [{server_name_indication, Hostname}];
                (Opt, Val) ->