diff --git a/repository/CrearUrl.go b/repository/CrearUrl.go
index c46a1f6..910b76c 100644
--- a/repository/CrearUrl.go
+++ b/repository/CrearUrl.go
@@ -40,7 +40,7 @@ func CrearUrl(longURL string, db *gorm.DB) (string, error) {
 
 	var url models.Url
 	for {
-		url.Shorturl = rand.Int64()
+		url.Shorturl = int64(rand.Uint64())
 		result = db.Model(&models.Url{}).Where("shorturl = ?", url.Shorturl).Count(&counturl)
 		if result.Error != nil {
 			return "", result.Error