diff --git a/htdocs/product/class/product.class.php b/htdocs/product/class/product.class.php
index 3ed33ef5235..5bf2f45d31c 100644
--- a/htdocs/product/class/product.class.php
+++ b/htdocs/product/class/product.class.php
@@ -4144,7 +4144,7 @@ class Product extends CommonObject
 	$parameters=array('id'=>$this->id);
 	// Note that $action and $object may have been modified by some hooks
 	$reshook=$hookmanager->executeHooks('loadvirtualstock', $parameters, $this, $action);
-	if ($reshook > 0) $this->stock_theorique+= $hookmanager->resPrint;
+	if ($reshook > 0) $this->stock_theorique = $hookmanager->resArray['stock_theorique'];
 
     }