diff --git a/addons/product/models/product_template.py b/addons/product/models/product_template.py
index 911481a003b..ef0f698424b 100644
--- a/addons/product/models/product_template.py
+++ b/addons/product/models/product_template.py
@@ -160,7 +160,7 @@ class ProductTemplate(models.Model):
         if pricelist_id_or_name:
             pricelist = None
             partner = self._context.get('partner')
-            quantity = self._context.get('quantity')
+            quantity = self._context.get('quantity', 1.0)
 
             # Support context pricelists specified as display_name or ID for compatibility
             if isinstance(pricelist_id_or_name, basestring):