diff --git a/craftgate/request/masterpass_retrieve_loyalties_request.py b/craftgate/request/masterpass_retrieve_loyalties_request.py
index 1c977d5..786be2b 100644
--- a/craftgate/request/masterpass_retrieve_loyalties_request.py
+++ b/craftgate/request/masterpass_retrieve_loyalties_request.py
@@ -7,9 +7,9 @@ def __init__(
             msisdn: Optional[str] = None,
             bin_number: Optional[str] = None,
             card_name: Optional[str] = None,
-            masterpassIntegrationVersion: Optional[int] = None
+            masterpass_integration_version: Optional[int] = None
     ) -> None:
         self.msisdn = msisdn
         self.bin_number = bin_number
         self.card_name = card_name
-        self.masterpassIntegrationVersion = masterpassIntegrationVersion
+        self.masterpass_integration_version = masterpass_integration_version