diff --git a/derp/derp_test.go b/derp/derp_test.go
index 9185194dd..436dd6d2e 100644
--- a/derp/derp_test.go
+++ b/derp/derp_test.go
@@ -22,6 +22,7 @@
 	"sync"
 	"testing"
 	"time"
+	"unique"
 
 	"go4.org/mem"
 	"golang.org/x/time/rate"
@@ -1598,3 +1599,40 @@ func TestServerRepliesToPing(t *testing.T) {
 		}
 	}
 }
+
+func BenchmarkUnique(b *testing.B) {
+	var key [32]byte
+	for i := range key {
+		key[i] = byte(i)
+	}
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			h := unique.Make(key)
+			if h.Value() != key {
+				b.Fatal("unexpected")
+			}
+		}
+	})
+}
+
+func BenchmarkLocalMap(b *testing.B) {
+	var key [32]byte
+	for i := range key {
+		key[i] = byte(i)
+	}
+	m := map[[32]byte]bool{
+		key: true,
+	}
+	k2 := key
+	for i := range k2 {
+		k2[0] = byte(i + 1)
+		m[k2] = false
+	}
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			if !m[key] {
+				b.Fatal("unexpected")
+			}
+		}
+	})
+}