diff --git a/src/Entity/PriceInformations/Pricedetail.php b/src/Entity/PriceInformations/Pricedetail.php
index 4b674e79..6b359a37 100644
--- a/src/Entity/PriceInformations/Pricedetail.php
+++ b/src/Entity/PriceInformations/Pricedetail.php
@@ -115,6 +115,7 @@ class Pricedetail extends DBElement
     /**
      * @var int
      * @ORM\Column(type="integer")
+     * @Assert\Positive()
      */
     protected $min_discount_quantity = 1;
 
diff --git a/src/Form/Part/PricedetailType.php b/src/Form/Part/PricedetailType.php
index 0794eaca..c9f0eade 100644
--- a/src/Form/Part/PricedetailType.php
+++ b/src/Form/Part/PricedetailType.php
@@ -48,8 +48,12 @@ class PricedetailType extends AbstractType
     public function buildForm(FormBuilderInterface $builder, array $options)
     {
         //No labels needed, we define translation in templates
-        $builder->add("min_discount_quantity", IntegerType::class);
-        $builder->add("price_related_quantity", IntegerType::class);
+        $builder->add("min_discount_quantity", IntegerType::class, [
+            'attr' => ['min' => 1]
+        ]);
+        $builder->add("price_related_quantity", IntegerType::class, [
+            'attr' => ['min' => 1]
+        ]);
         $builder->add("price", NumberType::class);
         $builder->add("currency", CurrencyEntityType::class, ['required' => false]);
     }