diff --git a/route/api/modbus.js b/route/api/modbus.js
index d4fb3f4..0aabb92 100644
--- a/route/api/modbus.js
+++ b/route/api/modbus.js
@@ -350,7 +350,7 @@ router
         res.db.database = config.db.db5;
         res.db.connect();
 
-        let query = "select count(*) sa c from ??.?? i \
+        let query = "select count(*) as c from ??.?? i \
 			left join ??.?? i2 \
 			on i2.`type` = i.`type` \
 			and i2.`addr` = ? \