diff --git a/outbox/unfollow.go b/outbox/unfollow.go
index 90c9620e..3e2ea931 100644
--- a/outbox/unfollow.go
+++ b/outbox/unfollow.go
@@ -26,6 +26,7 @@ import (
 	"github.com/dimkr/tootik/ap"
 	"github.com/dimkr/tootik/cfg"
 	"log/slog"
+	"time"
 )
 
 func Unfollow(ctx context.Context, log *slog.Logger, db *sql.DB, follower *ap.Actor, followed, followID string) error {
@@ -33,7 +34,7 @@ func Unfollow(ctx context.Context, log *slog.Logger, db *sql.DB, follower *ap.Ac
 		return fmt.Errorf("%s cannot unfollow %s", follower.ID, followed)
 	}
 
-	undoID := fmt.Sprintf("https://%s/undo/%x", cfg.Domain, sha256.Sum256([]byte(fmt.Sprintf("%s|%s", follower.ID, followed))))
+	undoID := fmt.Sprintf("https://%s/undo/%x", cfg.Domain, sha256.Sum256([]byte(fmt.Sprintf("%s|%s|%d", follower.ID, followed, time.Now().UnixNano()))))
 
 	to := ap.Audience{}
 	to.Add(followed)