diff --git a/sources/src/main/java/net/minecraft/server/NetworkManager.java b/sources/src/main/java/net/minecraft/server/NetworkManager.java
index b1f5e7e0a..9d59f699d 100644
--- a/sources/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/sources/src/main/java/net/minecraft/server/NetworkManager.java
@@ -1,5 +1,7 @@
 package net.minecraft.server;
 
+import com.googlecode.concurentlocks.ReentrantReadWriteUpdateLock;
+
 import com.google.common.collect.Queues;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import io.netty.channel.Channel;