diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/CombatCounter.java b/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/CombatCounter.java
index 6d09d92c6f..4c12d83363 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/CombatCounter.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/CombatCounter.java
@@ -89,9 +89,9 @@ public class CombatCounter extends Plugin
 	@Getter(AccessLevel.PACKAGE)
 	private Map<String, Long> counter = new HashMap<>();
 
-	private Map<String, Long> blowpipe = new HashMap<>();
+	private final Map<String, Long> blowpipe = new HashMap<>();
 
-	private Map<NPC, NPCDamageCounter> npcDamageMap = new HashMap<>();
+	private final Map<NPC, NPCDamageCounter> npcDamageMap = new HashMap<>();
 	Map<String, Double> playerDamage = new HashMap<>();
 
 	@Getter(AccessLevel.PACKAGE)
diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/NPCDamageCounter.java b/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/NPCDamageCounter.java
index 2c5a848c89..8e9d96e24e 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/NPCDamageCounter.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/combatcounter/NPCDamageCounter.java
@@ -10,9 +10,9 @@ import javax.inject.Singleton;
 class NPCDamageCounter
 {
 
-	Map<Integer, List<String>> attackers;
+	final Map<Integer, List<String>> attackers;
 
-	List<Integer> damage;
+	final List<Integer> damage;
 
 	NPCDamageCounter()
 	{