diff --git a/cache/src/main/java/net/runelite/cache/script/Instructions.java b/cache/src/main/java/net/runelite/cache/script/Instructions.java
index bbd356f018..754313c66b 100644
--- a/cache/src/main/java/net/runelite/cache/script/Instructions.java
+++ b/cache/src/main/java/net/runelite/cache/script/Instructions.java
@@ -261,7 +261,7 @@ public class Instructions
 		add(3301, 2, 0);
 		add(3302, 2, 1);
 		add(3303, 2, 1);
-		add(3304, 1, 1);
+		add(Opcodes.GET_INVENTORY_SIZE, "get_inventory_size", 1, 1);
 		add(Opcodes.GET_BOOSTEDSKILLLEVELS, "get_boostedskilllevels", 1, 1);
 		add(Opcodes.GET_REALSKILLLEVELS, "get_realskilllevels", 1, 1);
 		add(Opcodes.GET_SKILLEXPERIENCES, "get_skillexperiences", 1, 1);
diff --git a/cache/src/main/java/net/runelite/cache/script/Opcodes.java b/cache/src/main/java/net/runelite/cache/script/Opcodes.java
index 61fde40a1e..4fbb791eb1 100644
--- a/cache/src/main/java/net/runelite/cache/script/Opcodes.java
+++ b/cache/src/main/java/net/runelite/cache/script/Opcodes.java
@@ -119,6 +119,7 @@ public class Opcodes
 	public static final int WIDGET_GET_NAME_WIDGET = WIDGET_GET_NAME + 1000;
 	public static final int SEND_GAME_MESSAGE = 3100;
 	public static final int GET_GAMECYCLE = 3300;
+	public static final int GET_INVENTORY_SIZE = 3304;
 	public static final int GET_BOOSTEDSKILLLEVELS = 3305;
 	public static final int GET_REALSKILLLEVELS = 3306;
 	public static final int GET_SKILLEXPERIENCES = 3307;