1 files changed, 2 insertions, 2 deletions
diff --git a/src/main/java/org/traccar/database/DeviceManager.java b/src/main/java/org/traccar/database/DeviceManager.java
index fe17f7ced..e621e6058 100644
--- a/src/main/java/org/traccar/database/DeviceManager.java
+++ b/src/main/java/org/traccar/database/DeviceManager.java
@@ -45,11 +45,11 @@ public class DeviceManager extends BaseObjectManager<Device> implements Identity
 
     private final Config config;
     private final long dataRefreshDelay;
-    private boolean lookupGroupsAttribute;
+    private final boolean lookupGroupsAttribute;
 
     private Map<String, Device> devicesByUniqueId;
     private Map<String, Device> devicesByPhone;
-    private AtomicLong devicesLastUpdate = new AtomicLong();
+    private final AtomicLong devicesLastUpdate = new AtomicLong();
 
     private final Map<Long, Position> positions = new ConcurrentHashMap<>();