diff --git a/lib/NGCP/BulkProcessor/Dao/mr341/billing/voip_numbers.pm b/lib/NGCP/BulkProcessor/Dao/mr341/billing/voip_numbers.pm
index e8c5f5b..24e4337 100644
--- a/lib/NGCP/BulkProcessor/Dao/mr341/billing/voip_numbers.pm
+++ b/lib/NGCP/BulkProcessor/Dao/mr341/billing/voip_numbers.pm
@@ -42,7 +42,7 @@ my $expected_fieldnames = [
     'subscriber_id',
     'status',
     'ported',
-    #'list_timestamp',
+    'list_timestamp',
 ];
 
 my $indexes = {};
diff --git a/lib/NGCP/BulkProcessor/Dao/mr553/billing/voip_numbers.pm b/lib/NGCP/BulkProcessor/Dao/mr553/billing/voip_numbers.pm
index 3e2047a..db5761a 100644
--- a/lib/NGCP/BulkProcessor/Dao/mr553/billing/voip_numbers.pm
+++ b/lib/NGCP/BulkProcessor/Dao/mr553/billing/voip_numbers.pm
@@ -42,7 +42,7 @@ my $expected_fieldnames = [
     'subscriber_id',
     'status',
     'ported',
-    #'list_timestamp',
+    'list_timestamp',
 ];
 
 my $indexes = {};