diff --git a/internal/tun2/server_test.go b/internal/tun2/server_test.go
index f84d300..4ce5623 100644
--- a/internal/tun2/server_test.go
+++ b/internal/tun2/server_test.go
@@ -76,6 +76,7 @@ func TestBackendAuthV1(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer s.Close()
 
 	st.AddRoute(domain, user)
 	st.AddToken(token, user, []string{"connect"})
@@ -167,6 +168,7 @@ func TestBackendRouting(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+	defer s.Close()
 
 	l, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {