diff --git a/classes/Product.php b/classes/Product.php
index fbfc0d323..d14d49294 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -2700,8 +2700,8 @@ class ProductCore extends ObjectModel
 		if ($use_group_reduction)
 		{
 			$reduction_from_category = GroupReduction::getValueForProduct($id_product, $id_group);
-			
-			if (!empty($reduction_from_category))
+
+			if (!empty($reduction_from_category) && (float)$reduction_from_category == 0)
 				$price -= $price * (float)$reduction_from_category;
 			else // apply group reduction if there is no group reduction for this category
 				$price *= ((100 - Group::getReductionByIdGroup($id_group)) / 100);