diff --git a/sao/src/model.js b/sao/src/model.js
index 0808dd52c2..590034770c 100644
--- a/sao/src/model.js
+++ b/sao/src/model.js
@@ -142,13 +142,13 @@
             if (this.indexOf(record) < 0) {
                 this.splice(position, 0, record);
             }
-            for (var record_rm in this.record_removed) {
+            for (var record_rm of this.record_removed) {
                 if (record_rm.id == record.id) {
                     this.record_removed.splice(
                             this.record_removed.indexOf(record_rm), 1);
                 }
             }
-            for (var record_del in this.record_deleted) {
+            for (var record_del of this.record_deleted) {
                 if (record_del.id == record.id) {
                     this.record_deleted.splice(
                             this.record_deleted.indexOf(record_del), 1);