diff --git a/src/main/java/net/minecraft/world/WorldServer.java b/src/main/java/net/minecraft/world/WorldServer.java
index 67857d5..3c3d272 100644
--- a/src/main/java/net/minecraft/world/WorldServer.java
+++ b/src/main/java/net/minecraft/world/WorldServer.java
@@ -1001,6 +1001,7 @@
 	
 	private static final boolean isServer = FMLCommonHandler.instance().getSide().isServer();
 	private WorldConfig config;
+	@SideOnly(Side.SERVER)
 	private WorldBorder border;
 	@SideOnly(Side.SERVER)
 	private MobSpawnManager mobSpawner;