1 files changed, 1 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/protocol/Xt2400ProtocolDecoder.java b/src/main/java/org/traccar/protocol/Xt2400ProtocolDecoder.java
index c132f194b..31a1bbb11 100644
--- a/src/main/java/org/traccar/protocol/Xt2400ProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/Xt2400ProtocolDecoder.java
@@ -91,7 +91,7 @@ public class Xt2400ProtocolDecoder extends BaseProtocolDecoder {
         return length;
     }
 
-    private Map<Short, byte[]> formats = new HashMap<>();
+    private final Map<Short, byte[]> formats = new HashMap<>();
 
     public void setConfig(String configString) {
         Pattern pattern = Pattern.compile(":wycfg pcr\\[\\d+] ([0-9a-fA-F]{2})[0-9a-fA-F]{2}([0-9a-fA-F]+)");