diff --git a/htdocs/admin/knowledgemanagement.php b/htdocs/admin/knowledgemanagement.php
index ef80a03cbcb..72a71d50949 100644
--- a/htdocs/admin/knowledgemanagement.php
+++ b/htdocs/admin/knowledgemanagement.php
@@ -123,6 +123,7 @@ if ($action == 'updateMask') {
 		require_once $file;
 
 		$module = new $className($db);
+		'@phan-var-force CommonDocGenerator $module';
 
 		if ($module->write_file($tmpobject, $langs) > 0) {
 			header("Location: ".DOL_URL_ROOT."/document.php?modulepart=".strtolower($tmpobjectkey)."&file=SPECIMEN.pdf");