diff --git a/cache/src/main/java/net/runelite/cache/definitions/NpcDefinition.java b/cache/src/main/java/net/runelite/cache/definitions/NpcDefinition.java
index ddfabfe367..4c66d95fd8 100644
--- a/cache/src/main/java/net/runelite/cache/definitions/NpcDefinition.java
+++ b/cache/src/main/java/net/runelite/cache/definitions/NpcDefinition.java
@@ -64,4 +64,5 @@ public class NpcDefinition
 	public boolean rotationFlag = true;
 	public boolean isPet;
 	public Map<Integer, Object> params;
+	public int category;
 }
diff --git a/cache/src/main/java/net/runelite/cache/definitions/loaders/NpcLoader.java b/cache/src/main/java/net/runelite/cache/definitions/loaders/NpcLoader.java
index 0ce81f864b..1804340bcb 100644
--- a/cache/src/main/java/net/runelite/cache/definitions/loaders/NpcLoader.java
+++ b/cache/src/main/java/net/runelite/cache/definitions/loaders/NpcLoader.java
@@ -98,6 +98,10 @@ else if (opcode == 17)
 			def.rotate90RightAnimation = stream.readUnsignedShort();
 			def.rotate90LeftAnimation = stream.readUnsignedShort();
 		}
+		else if (opcode == 18)
+		{
+			def.category = stream.readUnsignedShort();
+		}
 		else if (opcode >= 30 && opcode < 35)
 		{
 			def.actions[opcode - 30] = stream.readString();