diff --git a/AltSign/Model/Apple API/ALTCertificate.h b/AltSign/Model/Apple API/ALTCertificate.h
index 04c1f0b..81dec56 100644
--- a/AltSign/Model/Apple API/ALTCertificate.h	
+++ b/AltSign/Model/Apple API/ALTCertificate.h	
@@ -16,8 +16,8 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic, copy) NSString *serialNumber;
 
 @property (nonatomic, copy, nullable) NSString *identifier;
-@property (nonatomic, copy, nullable) NSString *machineName;
-@property (nonatomic, copy, nullable) NSString *machineIdentifier;
+@property (nonatomic, copy, nullable) id machineName;
+@property (nonatomic, copy, nullable) id machineIdentifier;
 
 @property (nonatomic, copy, nullable) NSData *data;
 @property (nonatomic, copy, nullable) NSData *privateKey;