diff --git a/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_cactus.php b/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_cactus.php
index 0084a951882..55f8bb1f978 100644
--- a/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_cactus.php
+++ b/htdocs/core/modules/supplier_invoice/mod_facture_fournisseur_cactus.php
@@ -68,7 +68,7 @@ class mod_facture_fournisseur_cactus extends ModeleNumRefSuppliersInvoices
      */
     function canBeActivated()
     {
-    	global $conf,$langs;
+    	global $conf,$langs,$db;
 
         $siyymm=''; $max='';