.diff

diff --git a/core/src/main/java/org/jruby/ext/socket/RubyTCPServer.java b/core/src/main/java/org/jruby/ext/socket/RubyTCPServer.java
index ad2c7c60e9..17fd2bba3b 100644
--- a/core/src/main/java/org/jruby/ext/socket/RubyTCPServer.java
+++ b/core/src/main/java/org/jruby/ext/socket/RubyTCPServer.java
@@ -39,6 +39,7 @@ import java.nio.channels.Selector;
 import java.nio.channels.ServerSocketChannel;
 import java.nio.channels.SocketChannel;
 
+import jdk.net.ExtendedSocketOptions;
 import org.jruby.Ruby;
 import org.jruby.RubyClass;
 import org.jruby.RubyFixnum;
@@ -164,6 +165,7 @@ public class RubyTCPServer extends RubyTCPSocket {
                     SocketChannel connected = getServerSocketChannel().accept();
                     if (connected == null) continue;
 
+                    connected.setOption(ExtendedSocketOptions.TCP_QUICKACK, true);
                     connected.finishConnect();
 
                     // Force the client socket to be blocking