diff --git a/e2e/internal/kubeclient/portforward.go b/e2e/internal/kubeclient/portforward.go
index f6862191e2..4db31963cb 100644
--- a/e2e/internal/kubeclient/portforward.go
+++ b/e2e/internal/kubeclient/portforward.go
@@ -62,7 +62,7 @@ func (k *Kubeclient) PortForwardPod(ctx context.Context, namespace, podName, rem
 		cleanUp := func() {
 			close(stopCh)
 		}
-		return fmt.Sprintf("localhost:%d", ports[0].Local), cleanUp, nil
+		return net.JoinHostPort("localhost", ports[0].Local), cleanUp, nil
 
 	case <-ctx.Done():
 		close(stopCh)