diff --git a/models/repo.go b/models/repo.go
index 7e2cfd947..b5a9395ed 100644
--- a/models/repo.go
+++ b/models/repo.go
@@ -1968,6 +1968,11 @@ func DeleteRepository(doer *User, uid, repoID int64) error {
 		return err
 	}
 
+	if _, err = sess.In("issue_id", deleteCond).
+		Delete(&TrackedTime{}); err != nil {
+		return err
+	}
+
 	attachments = attachments[:0]
 	if err = sess.Join("INNER", "issue", "issue.id = attachment.issue_id").
 		Where("issue.repo_id = ?", repoID).