diff --git a/runelite-api/src/main/java/net/runelite/api/GraphicID.java b/runelite-api/src/main/java/net/runelite/api/GraphicID.java
index 6f2db34f74..f6c6138da6 100644
--- a/runelite-api/src/main/java/net/runelite/api/GraphicID.java
+++ b/runelite-api/src/main/java/net/runelite/api/GraphicID.java
@@ -24,7 +24,7 @@
  */
 package net.runelite.api;
 
-public class GraphicID
+public final class GraphicID
 {
 	public static final int WINE_MAKE = 47;
 	public static final int SPLASH = 85;
diff --git a/runelite-api/src/main/java/net/runelite/api/ParamID.java b/runelite-api/src/main/java/net/runelite/api/ParamID.java
index 9be05d76ef..50d2bdf71f 100644
--- a/runelite-api/src/main/java/net/runelite/api/ParamID.java
+++ b/runelite-api/src/main/java/net/runelite/api/ParamID.java
@@ -27,7 +27,7 @@ package net.runelite.api;
 /**
  * @see ParamHolder
  */
-public class ParamID
+public final class ParamID
 {
 	/**
 	 * @see SettingID
diff --git a/runelite-api/src/main/java/net/runelite/api/ProjectileID.java b/runelite-api/src/main/java/net/runelite/api/ProjectileID.java
index 1c1f82ae76..4030f92e56 100644
--- a/runelite-api/src/main/java/net/runelite/api/ProjectileID.java
+++ b/runelite-api/src/main/java/net/runelite/api/ProjectileID.java
@@ -29,7 +29,7 @@ package net.runelite.api;
  * <p>
  * Note: This class is not complete and may be missing mapped IDs.
  */
-public class ProjectileID
+public final class ProjectileID
 {
 	public static final int CANNONBALL = 53;
 	public static final int GRANITE_CANNONBALL = 1443;
diff --git a/runelite-api/src/main/java/net/runelite/api/SettingID.java b/runelite-api/src/main/java/net/runelite/api/SettingID.java
index 2d471d16f2..bac3bd9be4 100644
--- a/runelite-api/src/main/java/net/runelite/api/SettingID.java
+++ b/runelite-api/src/main/java/net/runelite/api/SettingID.java
@@ -27,7 +27,7 @@ package net.runelite.api;
 /**
  * @see ParamID#SETTING_ID
  */
-public class SettingID
+public final class SettingID
 {
 	public static final int CAMERA_ZOOM = 14;
 
diff --git a/runelite-api/src/main/java/net/runelite/api/StructID.java b/runelite-api/src/main/java/net/runelite/api/StructID.java
index e1dab81026..54b61c4b02 100644
--- a/runelite-api/src/main/java/net/runelite/api/StructID.java
+++ b/runelite-api/src/main/java/net/runelite/api/StructID.java
@@ -29,7 +29,7 @@ package net.runelite.api;
  * @see StructComposition
  * @see Client#getStructComposition(int)
  */
-public class StructID
+public final class StructID
 {
 	public static final int SETTINGS_MUSIC_VOLUME = 2753;
 	public static final int SETTINGS_EFFECT_VOLUME = 2754;