diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/raidsthieving/BatSolver/ChestIdentifier.java b/runelite-client/src/main/java/net/runelite/client/plugins/raidsthieving/BatSolver/ChestIdentifier.java
index 8cf12f817a..9e25a8b5d0 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/raidsthieving/BatSolver/ChestIdentifier.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/raidsthieving/BatSolver/ChestIdentifier.java
@@ -256,5 +256,5 @@ public class ChestIdentifier
 		chest.setChestId(id);
 	}
 
-	private Map<InstancePoint, Integer> chestIds;
+	private final Map<InstancePoint, Integer> chestIds;
 }