diff --git a/portlist/portlist_test.go b/portlist/portlist_test.go
index 08d7995a6d829..1987c91d5d140 100644
--- a/portlist/portlist_test.go
+++ b/portlist/portlist_test.go
@@ -195,12 +195,23 @@ func TestSameInodes(t *testing.T) {
 }
 
 func BenchmarkGetList(b *testing.B) {
+	benchmarkGetList(b, false)
+}
+
+func BenchmarkGetListIncremental(b *testing.B) {
+	benchmarkGetList(b, true)
+}
+
+func benchmarkGetList(b *testing.B, incremental bool) {
 	b.ReportAllocs()
 	var p Poller
 	for i := 0; i < b.N; i++ {
-		_, err := p.getList()
+		pl, err := p.getList()
 		if err != nil {
 			b.Fatal(err)
 		}
+		if incremental {
+			p.prev = pl
+		}
 	}
 }