diff --git a/test/parallel/test-net-server-simultaneous-accepts-produce-warning-once.js b/test/parallel/test-net-server-simultaneous-accepts-produce-warning-once.js
new file mode 100644
index 00000000000000..ffca38f603b2a9
--- /dev/null
+++ b/test/parallel/test-net-server-simultaneous-accepts-produce-warning-once.js
@@ -0,0 +1,12 @@
+'use strict';
+
+const { expectWarning } = require('../common');
+const net = require('net');
+
+expectWarning(
+  'DeprecationWarning',
+  'net._setSimultaneousAccepts() is deprecated and will be removed.',
+  'DEP0121');
+
+net._setSimultaneousAccepts();
+net._setSimultaneousAccepts();