diff --git a/oid4vci/src/token_request.rs b/oid4vci/src/token_request.rs
index b784fb9..63194be 100644
--- a/oid4vci/src/token_request.rs
+++ b/oid4vci/src/token_request.rs
@@ -3,7 +3,7 @@ use serde_with::skip_serializing_none;
 
 /// Token Request as described here: https://openid.net/specs/openid-4-verifiable-credential-issuance-1_0-13.html#name-token-request
 #[skip_serializing_none]
-#[derive(Serialize, Deserialize, Debug, PartialEq)]
+#[derive(Serialize, Deserialize, Debug, PartialEq, Clone)]
 #[serde(tag = "grant_type")]
 pub enum TokenRequest {
     #[serde(rename = "authorization_code")]
diff --git a/oid4vci/src/wallet/mod.rs b/oid4vci/src/wallet/mod.rs
index f2895c8..e4ed3df 100644
--- a/oid4vci/src/wallet/mod.rs
+++ b/oid4vci/src/wallet/mod.rs
@@ -233,7 +233,7 @@ impl<CFC: CredentialFormatCollection + DeserializeOwned> Wallet<CFC> {
                             .ok_or(anyhow::anyhow!("No c_nonce found."))?
                             .clone(),
                     )
-                    .subject_syntax_type(&subject_syntax_type.to_string())
+                    .subject_syntax_type(subject_syntax_type.to_string())
                     .build()
                     .await?,
             ),