diff --git a/test/parallel/test-net-autoselectfamily-commandline-option.js b/test/parallel/test-net-autoselectfamily-commandline-option.js
index 5687d31b2eec42..346f95011c5952 100644
--- a/test/parallel/test-net-autoselectfamily-commandline-option.js
+++ b/test/parallel/test-net-autoselectfamily-commandline-option.js
@@ -85,6 +85,10 @@ function createDnsServer(ipv6Addr, ipv4Addr, cb) {
         if (common.hasIPv6) {
           assert.strictEqual(error.code, 'ECONNREFUSED');
           assert.strictEqual(error.message, `connect ECONNREFUSED ::1:${port}`);
+        } else if (common.isIBMi) {
+          // IBMi returns EUNATCH (ERRNO 42) when IPv6 is disabled
+          // keep this errno assertion until EUNATCH is recognized by libuv
+          assert.strictEqual(error.errno, -42);
         } else {
           assert.strictEqual(error.code, 'EADDRNOTAVAIL');
           assert.strictEqual(error.message, `connect EADDRNOTAVAIL ::1:${port} - Local (:::0)`);