diff --git a/src/fido.rs b/src/fido.rs
index a98ed4d..655ca8d 100644
--- a/src/fido.rs
+++ b/src/fido.rs
@@ -64,20 +64,20 @@ pub struct U2fRegistrationData {
 
 impl U2fRegistrationData {
     pub fn from(app_id: &str, client_data: &str, register_result: RegisterResult) -> XResult<Self> {
-        let rr = opt_result!(
+        let registration = opt_result!(
             u2f::register::parse_registration(app_id.to_string(), client_data.as_bytes().to_vec(), register_result.0.to_vec()),
             "Parse registration data failed: {}");
         Ok(Self {
             app_id: app_id.to_string(),
             device_info: U2FDeviceInfo::from(&register_result),
-            device_name: rr.device_name,
+            device_name: registration.device_name,
             client_data: client_data.into(),
             registration_data: base64::encode(&register_result.0),
-            attestation_cert_pem: rr.attestation_cert.map(|c| {
+            attestation_cert_pem: registration.attestation_cert.map(|c| {
                 to_pem(&c, "CERTIFICATE", 64)
             }),
-            pub_key: hex::encode(rr.pub_key),
-            key_handle: hex::encode(rr.key_handle),
+            pub_key: hex::encode(registration.pub_key),
+            key_handle: hex::encode(registration.key_handle),
         })
     }
 }