diff --git a/src/main/java/ysoserial/exploit/JRMPListener.java b/src/main/java/ysoserial/exploit/JRMPListener.java
index c93f3d5..b019103 100644
--- a/src/main/java/ysoserial/exploit/JRMPListener.java
+++ b/src/main/java/ysoserial/exploit/JRMPListener.java
@@ -150,7 +150,11 @@ public class JRMPListener implements Runnable {
                         switch ( protocol ) {
                         case TransportConstants.StreamProtocol:
                             out.writeByte(TransportConstants.ProtocolAck);
-                            out.writeUTF(remote.getHostString());
+                            if ( remote.getHostName() != null ) {
+                                out.writeUTF(remote.getHostName());
+                            } else {
+                                out.writeUTF(remote.getAddress().toString());
+                            }
                             out.writeInt(remote.getPort());
                             out.flush();
                             in.readUTF();