diff --git a/oscar_odin/resources/catalogue.py b/oscar_odin/resources/catalogue.py
index b9fe1b4..b87569b 100644
--- a/oscar_odin/resources/catalogue.py
+++ b/oscar_odin/resources/catalogue.py
@@ -109,7 +109,7 @@ class Product(OscarCatalogue):
     price: Decimal = DecimalField(null=True)
     currency: Optional[str]
     availability: Optional[int]
-    is_available_to_buy: bool
+    is_available_to_buy: Optional[bool]
     partner: Optional[Any]
 
     product_class: Optional[ProductClass] = None