diff --git a/test/parallel/test-benchmark-dgram.js b/test/sequential/test-benchmark-dgram.js
similarity index 63%
rename from test/parallel/test-benchmark-dgram.js
rename to test/sequential/test-benchmark-dgram.js
index 69eafbcb13b..8c93cd5a0c9 100644
--- a/test/parallel/test-benchmark-dgram.js
+++ b/test/sequential/test-benchmark-dgram.js
@@ -4,6 +4,10 @@ require('../common');
 
 const runBenchmark = require('../common/benchmark');
 
+// Because the dgram benchmarks use hardcoded ports, this should be in
+// sequential rather than parallel to make sure it does not conflict with
+// tests that choose random available ports.
+
 runBenchmark('dgram', ['address=true',
                        'chunks=2',
                        'dur=0.1',