diff --git a/app/DataMapper/ClientSettings.php b/app/DataMapper/ClientSettings.php
index 41f29d0106e2..8298c639b5c6 100644
--- a/app/DataMapper/ClientSettings.php
+++ b/app/DataMapper/ClientSettings.php
@@ -45,6 +45,7 @@ class ClientSettings extends BaseSettings
 
 	public $custom_taxes1;
 	public $custom_taxes2;
+	public $lock_sent_invoices;
 
 	/**
 	 * settings which which are unique to client settings
@@ -93,6 +94,7 @@ class ClientSettings extends BaseSettings
 			'inclusive_taxes' => NULL,
 			'custom_taxes1' => NULL,
 			'custom_taxes2' => NULL,
+			'lock_sent_invoices' => NULL,
 		];
 
 	}
diff --git a/app/DataMapper/CompanySettings.php b/app/DataMapper/CompanySettings.php
index f812e127e911..0947acad3685 100644
--- a/app/DataMapper/CompanySettings.php
+++ b/app/DataMapper/CompanySettings.php
@@ -66,7 +66,8 @@ class CompanySettings extends BaseSettings
 	public $custom_message_unpaid_invoice;
 	public $custom_message_paid_invoice;
 	public $custom_message_unapproved_quote;
-	
+	public $lock_sent_invoices;
+
 	public $inclusive_taxes;
 
 	public $translations;
@@ -109,6 +110,7 @@ class CompanySettings extends BaseSettings
 			'inclusive_taxes' => 1,
 			'custom_taxes1' => 0,
 			'custom_taxes2' => 0,
+			'lock_sent_invoices' => 0,
 
 			'translations' => (object) [],
 		];