diff --git a/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly b/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly
index ee4992da0cf6ca703b8ba941d67974200e9fa270..028fa38edf9205c931867f19b1e29782dd89cbf2 100644
--- a/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly
+++ b/core/src/main/resources/hudson/TcpSlaveAgentListener/index.jelly
@@ -25,8 +25,10 @@ THE SOFTWARE.
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:f="/lib/form" xmlns:i="jelly:fmt">
   <!--
     Publicize the TCP port number for JNLP slave agents so that they know where to conenct.
+    Keep the legacy header for better backward compatibility
   -->
   <st:header name="X-Hudson-JNLP-Port" value="${app.tcpSlaveAgentListener.port}" />
+  <st:header name="X-Jenkins-JNLP-Port" value="${app.tcpSlaveAgentListener.port}" />
 
-  Hudson
-</j:jelly>
\ No newline at end of file
+  Jenkins
+</j:jelly>