diff --git a/Backend/Controllers/BuildInfoController.cs b/Backend/Controllers/BuildInfoController.cs
index 24faf5b..c03565a 100644
--- a/Backend/Controllers/BuildInfoController.cs
+++ b/Backend/Controllers/BuildInfoController.cs
@@ -429,7 +429,7 @@ namespace Backend.Controllers
 
             try
             {
-                var sqlString = @$"SELECT A.floor_guid, A.full_name, InitMapName + '.svg' AS 'initMapName', A.priority, A.created_at
+                var sqlString = @$"SELECT A.floor_guid, A.full_name, CONCAT(InitMapName, '.svg') AS 'initMapName', A.priority, A.created_at
                                    FROM floor A
                                    WHERE deleted = @deleted
                                    AND A.building_tag = @building_tag