diff --git a/htdocs/core/modules/project/modules_project.php b/htdocs/core/modules/project/modules_project.php
index dc3f19d72fd..894df4bf8f3 100644
--- a/htdocs/core/modules/project/modules_project.php
+++ b/htdocs/core/modules/project/modules_project.php
@@ -127,6 +127,11 @@ abstract class ModeleNumRefProjects
 	 */
 	public $error = '';
 
+	/**
+	 * @var string $version
+	 */
+	public $version;
+
 	/**
 	 *  Return if a module can be used or not
 	 *