diff --git a/mrp_operations_extension/models/mrp_bom.py b/mrp_operations_extension/models/mrp_bom.py
index 6d04d6dbb..4361921ff 100644
--- a/mrp_operations_extension/models/mrp_bom.py
+++ b/mrp_operations_extension/models/mrp_bom.py
@@ -13,8 +13,9 @@ class MrpBom(models.Model):
     def _prepare_wc_line(self, wc_use, level=0, factor=1):
         res = super(MrpBom, self)._prepare_wc_line(
             wc_use, level=level, factor=factor)
-        if not self.env['mrp.config.settings']._get_parameter('cycle.by.bom',
-                                                              False) == 'True':
+        cycle_by_bom = self.env['mrp.config.settings']._get_parameter(
+            'cycle.by.bom')
+        if not (cycle_by_bom and cycle_by_bom.value == 'True'):
             production = self.env.context.get('production')
             factor = self._factor(production and production.product_qty or 1,
                                   self.product_efficiency,