diff --git a/rtc_udh/src/lib.rs b/rtc_udh/src/lib.rs
index bba43649..f2a4097d 100644
--- a/rtc_udh/src/lib.rs
+++ b/rtc_udh/src/lib.rs
@@ -45,7 +45,7 @@ fn get_responder(id: &u64) -> Result<SyncSendResponder, sgx_status_t> {
         .or(Err(sgx_status_t::SGX_ERROR_UNEXPECTED))?
         .get(id)
         .ok_or(sgx_status_t::SGX_ERROR_INVALID_ENCLAVE_ID)
-        .map(Clone::clone)
+        .cloned()
 }
 
 #[no_mangle]