diff --git a/htdocs/blockedlog/class/blockedlog.class.php b/htdocs/blockedlog/class/blockedlog.class.php
index d7302a2c795..4413b78a6a4 100644
--- a/htdocs/blockedlog/class/blockedlog.class.php
+++ b/htdocs/blockedlog/class/blockedlog.class.php
@@ -1048,6 +1048,7 @@ class BlockedLog
 		if (empty($conf->global->BLOCKEDLOG_ENTITY_FINGERPRINT)) { // creation of a unique fingerprint
 
 			require_once DOL_DOCUMENT_ROOT.'/core/lib/admin.lib.php';
+			require_once DOL_DOCUMENT_ROOT.'/core/lib/security.lib.php';
 			require_once DOL_DOCUMENT_ROOT.'/core/lib/security2.lib.php';
 
 			$fingerprint = dol_hash(print_r($mysoc, true).getRandomPassword(1), '5');