diff --git a/htdocs/mrp/class/mo.class.php b/htdocs/mrp/class/mo.class.php
index 570281ac294..5f753f24443 100644
--- a/htdocs/mrp/class/mo.class.php
+++ b/htdocs/mrp/class/mo.class.php
@@ -649,7 +649,7 @@ class Mo extends CommonObject
 							if ($line->qty_frozen) {
 								$moline->qty = $line->qty; // Qty to consume does not depends on quantity to produce
 							} else {
-								$moline->qty = round($line->qty * ($this->qty / $bom->qty) / $line->efficiency, 8); // Calculate with Qty to produce and  more presition
+								$moline->qty = price2num(($line->qty / $bom->qty) * $this->qty / $line->efficiency, 'MS'); // Calculate with Qty to produce and  more presition
 							}
 							if ($moline->qty <= 0) {
 								$error++;