diff --git a/src/backup/key_derivation.rs b/src/backup/key_derivation.rs
index 73478c00..6b6e7484 100644
--- a/src/backup/key_derivation.rs
+++ b/src/backup/key_derivation.rs
@@ -278,7 +278,7 @@ pub fn rsa_decrypt_key_config(
     let decrypted = rsa
         .private_decrypt(key, &mut buffer, openssl::rsa::Padding::PKCS1)
         .map_err(|err| format_err!("failed to decrypt KeyConfig using RSA - {}", err))?;
-    decrypt_key(&mut buffer[..decrypted], passphrase)
+    decrypt_key(&buffer[..decrypted], passphrase)
 }
 
 #[test]
diff --git a/src/tape/sgutils2.rs b/src/tape/sgutils2.rs
index 31cd61b5..65deed70 100644
--- a/src/tape/sgutils2.rs
+++ b/src/tape/sgutils2.rs
@@ -191,16 +191,16 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
         }
 
         // todo: what about sense data?
-        let _sense_len = unsafe { get_scsi_pt_sense_len(&mut *ptvp) };
+        let _sense_len = unsafe { get_scsi_pt_sense_len(&*ptvp) };
 
-        let status = unsafe { get_scsi_pt_status_response(&mut *ptvp) };
+        let status = unsafe { get_scsi_pt_status_response(&*ptvp) };
         if status != 0 {
             // toto: improve error reporting
             bail!("unknown scsi error - status response {}", status);
         }
 
         let data_len = self.buffer.len() -
-            (unsafe { get_scsi_pt_resid(&mut *ptvp) } as usize);
+            (unsafe { get_scsi_pt_resid(&*ptvp) } as usize);
         if data_len == 0 {
             bail!("do_scsi_pt failed - no data received");
         }
@@ -248,9 +248,9 @@ impl <'a, F: AsRawFd> SgRaw<'a, F> {
         }
 
         // todo: what about sense data?
-        let _sense_len = unsafe { get_scsi_pt_sense_len(&mut *ptvp) };
+        let _sense_len = unsafe { get_scsi_pt_sense_len(&*ptvp) };
 
-        let status = unsafe { get_scsi_pt_status_response(&mut *ptvp) };
+        let status = unsafe { get_scsi_pt_status_response(&*ptvp) };
         if status != 0 {
             // toto: improve error reporting
             bail!("unknown scsi error - status response {}", status);