diff --git a/test/phpunit/NumberingModulesTest.php b/test/phpunit/NumberingModulesTest.php
index 0107edc1f8d..b29cd03b2c9 100644
--- a/test/phpunit/NumberingModulesTest.php
+++ b/test/phpunit/NumberingModulesTest.php
@@ -137,7 +137,8 @@ class NumberingModulesTest extends PHPUnit_Framework_TestCase
 		$conf->global->FACTURE_ADDON='mercure';
 		$conf->global->FACTURE_MERCURE_MASK_CREDIT='{yyyy}-{0000}';
 		$conf->global->FACTURE_MERCURE_MASK_INVOICE='{yyyy}-{0000}';
-
+        $conf->global->INVOICE_CAN_ALWAYS_BE_REMOVED=0;
+        
 		$localobject=new Facture($this->savdb);
 		$localobject->initAsSpecimen();
 		$localobject->date=dol_mktime(12, 0, 0, 1, 1, 1915);	// we use year 1915 to be sure to not have existing invoice for this year