diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsOverlay.java b/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsOverlay.java
index a1d69ccff2..1fe970e620 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsOverlay.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsOverlay.java
@@ -27,7 +27,7 @@ package net.runelite.client.plugins.pileindicators;
 import java.awt.Color;
 import java.awt.Dimension;
 import java.awt.Graphics2D;
-import java.util.ArrayList;
+import java.util.List;
 import javax.inject.Inject;
 import javax.inject.Singleton;
 import net.runelite.api.Actor;
@@ -56,11 +56,11 @@ public class PileIndicatorsOverlay extends Overlay
 	@Override
 	public Dimension render(Graphics2D graphics)
 	{
-		ArrayList<ArrayList<Actor>> stackList = plugin.getStacks();
+		List<List<Actor>> stackList = plugin.getStacks();
 
 		if (stackList != null)
 		{
-			for (ArrayList<Actor> actorArrayList : stackList)
+			for (List<Actor> actorArrayList : stackList)
 			{
 				PileType pileType = plugin.getPileType(actorArrayList);
 				Color pileColor = plugin.getColorByPileType(pileType);
diff --git a/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsPlugin.java b/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsPlugin.java
index 32e04d6612..c886770474 100644
--- a/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsPlugin.java
+++ b/runelite-client/src/main/java/net/runelite/client/plugins/pileindicators/PileIndicatorsPlugin.java
@@ -27,6 +27,7 @@ package net.runelite.client.plugins.pileindicators;
 import com.google.inject.Provides;
 import java.awt.Color;
 import java.util.ArrayList;
+import java.util.List;
 import javax.inject.Inject;
 import javax.inject.Singleton;
 import lombok.AccessLevel;
@@ -103,11 +104,11 @@ public class PileIndicatorsPlugin extends Plugin
 		overlayManager.remove(overlay);
 	}
 
-	ArrayList<ArrayList<Actor>> getStacks()
+	List<List<Actor>> getStacks()
 	{
-		ArrayList<ArrayList<Actor>> outerArrayList = new ArrayList<>();
+		List<List<Actor>> outerArrayList = new ArrayList<>();
 
-		ArrayList<Actor> pileList = new ArrayList<>();
+		List<Actor> pileList = new ArrayList<>();
 
 		if (this.enableNPCS)
 		{
@@ -175,7 +176,7 @@ public class PileIndicatorsPlugin extends Plugin
 		return null;
 	}
 
-	PileType getPileType(ArrayList<Actor> pile)
+	PileType getPileType(List<Actor> pile)
 	{
 		PileType pileType = null;