diff --git a/internal/repository/repack_test.go b/internal/repository/repack_test.go
index 526fa98ea..87470d815 100644
--- a/internal/repository/repack_test.go
+++ b/internal/repository/repack_test.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"math/rand"
 	"testing"
+	"time"
 
 	"github.com/restic/restic/internal/index"
 	"github.com/restic/restic/internal/repository"
@@ -195,7 +196,7 @@ func TestRepack(t *testing.T) {
 	repo, cleanup := repository.TestRepository(t)
 	defer cleanup()
 
-	seed := rand.Int63()
+	seed := time.Now().UnixNano()
 	rand.Seed(seed)
 	t.Logf("rand seed is %v", seed)
 
@@ -262,7 +263,7 @@ func TestRepackWrongBlob(t *testing.T) {
 	repo, cleanup := repository.TestRepository(t)
 	defer cleanup()
 
-	seed := rand.Int63()
+	seed := time.Now().UnixNano()
 	rand.Seed(seed)
 	t.Logf("rand seed is %v", seed)