diff --git a/src/main/java/gc/mda/signal_batch/monitoring/controller/MonitoringController.java b/src/main/java/gc/mda/signal_batch/monitoring/controller/MonitoringController.java
index ac7482a..dcc29b0 100644
--- a/src/main/java/gc/mda/signal_batch/monitoring/controller/MonitoringController.java
+++ b/src/main/java/gc/mda/signal_batch/monitoring/controller/MonitoringController.java
@@ -93,8 +93,8 @@ public class MonitoringController {
                 CONCAT('대해구 ', h.haegu_no) as haegu_name,
                 COUNT(DISTINCT a.mmsi) as current_vessels,
                 ROUND(AVG(a.sog)::numeric, 1) as avg_speed,
-                ROUND(COUNT(DISTINCT a.mmsi)::numeric /
-                    GREATEST((h.max_lat - h.min_lat) * (h.max_lon - h.min_lon) * 12321, 0.01),
+                ROUND((COUNT(DISTINCT a.mmsi)::numeric /
+                    GREATEST((h.max_lat - h.min_lat) * (h.max_lon - h.min_lon) * 12321, 0.01))::numeric,
                     4) as avg_density,
                 MAX(a.last_update) as last_update,
                 h.center_lon,