diff --git a/models/issues/label.go b/models/issues/label.go
index bbdc99e265..2ee66fe9da 100644
--- a/models/issues/label.go
+++ b/models/issues/label.go
@@ -755,7 +755,7 @@ func CountOrphanedLabels() (int64, error) {
 	norepo, err := db.GetEngine(db.DefaultContext).Table("label").
 		Where(builder.And(
 			builder.Gt{"repo_id": 0},
-			builder.NotIn("repo_id", builder.Select("id").From("repository")),
+			builder.NotIn("repo_id", builder.Select("id").From("`repository`")),
 		)).
 		Count()
 	if err != nil {
@@ -765,7 +765,7 @@ func CountOrphanedLabels() (int64, error) {
 	noorg, err := db.GetEngine(db.DefaultContext).Table("label").
 		Where(builder.And(
 			builder.Gt{"org_id": 0},
-			builder.NotIn("org_id", builder.Select("id").From("user")),
+			builder.NotIn("org_id", builder.Select("id").From("`user`")),
 		)).
 		Count()
 	if err != nil {
@@ -786,7 +786,7 @@ func DeleteOrphanedLabels() error {
 	if _, err := db.GetEngine(db.DefaultContext).
 		Where(builder.And(
 			builder.Gt{"repo_id": 0},
-			builder.NotIn("repo_id", builder.Select("id").From("repository")),
+			builder.NotIn("repo_id", builder.Select("id").From("`repository`")),
 		)).
 		Delete(Label{}); err != nil {
 		return err
@@ -796,7 +796,7 @@ func DeleteOrphanedLabels() error {
 	if _, err := db.GetEngine(db.DefaultContext).
 		Where(builder.And(
 			builder.Gt{"org_id": 0},
-			builder.NotIn("org_id", builder.Select("id").From("user")),
+			builder.NotIn("org_id", builder.Select("id").From("`user`")),
 		)).
 		Delete(Label{}); err != nil {
 		return err