diff --git a/services/migrations/gitea_uploader.go b/services/migrations/gitea_uploader.go
index 21f587604952..be949559d4d3 100644
--- a/services/migrations/gitea_uploader.go
+++ b/services/migrations/gitea_uploader.go
@@ -412,6 +412,10 @@ func (g *GiteaLocalUploader) CreateIssues(issues ...*base.Issue) error {
 			},
 		}
 
+		if is.ForeignReference.ForeignIndex == "0" {
+			is.ForeignReference.ForeignIndex = strconv.FormatInt(is.Index, 10)
+		}
+
 		if err := g.remapUser(issue, &is); err != nil {
 			return err
 		}