diff --git a/lib/net/pool.js b/lib/net/pool.js
index b8b606e1..aedeffc1 100644
--- a/lib/net/pool.js
+++ b/lib/net/pool.js
@@ -3733,7 +3733,7 @@ class PoolOptions {
     }
 
     if (options.publicPort != null) {
-      assert((options.publicPort & 0xff) === options.publicPort);
+      assert((options.publicPort & 0xffff) === options.publicPort);
       this.publicPort = options.publicPort;
     }