diff --git a/internal/bootstrap/bootstrap_test.go b/internal/bootstrap/bootstrap_test.go
index b62f32b1b..ac2e5252a 100644
--- a/internal/bootstrap/bootstrap_test.go
+++ b/internal/bootstrap/bootstrap_test.go
@@ -25,7 +25,8 @@ const testTimeout = 1 * time.Second
 func newListener(t testing.TB, network string, sig chan net.Addr) (l net.Listener) {
 	t.Helper()
 
-	l, err := net.Listen(network, ":0")
+	// TODO(e.burkov):  Listen IPv6 as well, when the CI adds IPv6 interfaces.
+	l, err := net.Listen(network, "127.0.0.1:0")
 	require.NoError(t, err)
 	testutil.CleanupAndRequireSuccess(t, l.Close)
 
@@ -59,10 +60,6 @@ func TestResolveDialContext(t *testing.T) {
 		name:       "v4",
 		addresses:  []netip.Addr{netutil.IPv4Localhost()},
 		preferIPv6: false,
-	}, {
-		name:       "v6",
-		addresses:  []netip.Addr{netutil.IPv6Localhost()},
-		preferIPv6: false,
 	}, {
 		name:       "both_prefer_v6",
 		addresses:  []netip.Addr{netutil.IPv4Localhost(), netutil.IPv6Localhost()},
diff --git a/internal/bootstrap/resolver.go b/internal/bootstrap/resolver.go
index 57d6cb941..332459aa5 100644
--- a/internal/bootstrap/resolver.go
+++ b/internal/bootstrap/resolver.go
@@ -2,6 +2,7 @@ package bootstrap
 
 import (
 	"context"
+	"net"
 	"net/netip"
 	"time"
 
@@ -16,6 +17,9 @@ type Resolver interface {
 	LookupNetIP(ctx context.Context, network string, host string) (addrs []netip.Addr, err error)
 }
 
+// type check
+var _ Resolver = &net.Resolver{}
+
 // ErrNoResolvers is returned when zero resolvers specified.
 const ErrNoResolvers = errors.Error("no resolvers specified")