diff --git a/htdocs/bom/class/bom.class.php b/htdocs/bom/class/bom.class.php
index 539046c593b..512044fedb2 100644
--- a/htdocs/bom/class/bom.class.php
+++ b/htdocs/bom/class/bom.class.php
@@ -1028,10 +1028,20 @@ class BOM extends CommonObject
 	 */
 	public function calculateCosts()
 	{
+		global $hookmanager;
+
 		include_once DOL_DOCUMENT_ROOT.'/product/class/product.class.php';
 		$this->unit_cost = 0;
 		$this->total_cost = 0;
 
+		$parameters=array();
+		$reshook = $hookmanager->executeHooks('calculateCostsBom', $parameters, $this); // Note that $action and $object may have been modified by hook
+
+
+		if ($reshook > 0) {
+			return $hookmanager->resPrint;
+		}
+
 		if (is_array($this->lines) && count($this->lines)) {
 			require_once DOL_DOCUMENT_ROOT.'/fourn/class/fournisseur.product.class.php';
 			$productFournisseur = new ProductFournisseur($this->db);
@@ -1078,6 +1088,9 @@ class BOM extends CommonObject
 				$this->unit_cost = price2num($this->total_cost * $this->qty, 'MU');
 			}
 		}
+
+
+
 	}
 
 	/**