diff --git a/protocol/src/main/java/org/geysermc/mcprotocollib/network/tcp/TcpServer.java b/protocol/src/main/java/org/geysermc/mcprotocollib/network/tcp/TcpServer.java
index 1725d99d6..48263729f 100644
--- a/protocol/src/main/java/org/geysermc/mcprotocollib/network/tcp/TcpServer.java
+++ b/protocol/src/main/java/org/geysermc/mcprotocollib/network/tcp/TcpServer.java
@@ -13,6 +13,7 @@
 import org.geysermc.mcprotocollib.network.BuiltinFlags;
 import org.geysermc.mcprotocollib.network.helper.TransportHelper;
 import org.geysermc.mcprotocollib.network.packet.PacketProtocol;
+import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -52,7 +53,7 @@ public void bindImpl(boolean wait, final Runnable callback) {
                 .localAddress(this.getHost(), this.getPort())
                 .childHandler(new ChannelInitializer<>() {
             @Override
-            public void initChannel(Channel channel) {
+            public void initChannel(@NotNull Channel channel) {
                 InetSocketAddress address = (InetSocketAddress) channel.remoteAddress();
                 PacketProtocol protocol = createPacketProtocol();