diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/experiencedrop/XpDropPlugin.java b/runelite-client/src/main/java/net/runelite/client/plugins/experiencedrop/XpDropPlugin.java
index a94da44953..be5643bb68 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/experiencedrop/XpDropPlugin.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/experiencedrop/XpDropPlugin.java
@@ -103,7 +103,7 @@ public class XpDropPlugin extends Plugin
 	private boolean hasDropped = false;
 	private boolean correctPrayer;
 	private Skill lastSkill = null;
-	private Map<Skill, Integer> previousSkillExpTable = new EnumMap<>(Skill.class);
+	private final Map<Skill, Integer> previousSkillExpTable = new EnumMap<>(Skill.class);
 	private PrayerType currentTickPrayer;
 	private XpDropConfig.DamageMode damageMode;