diff --git a/cmd/lotus-miner/init.go b/cmd/lotus-miner/init.go
index c3e1c2770..a5e9710a9 100644
--- a/cmd/lotus-miner/init.go
+++ b/cmd/lotus-miner/init.go
@@ -564,7 +564,7 @@ func makeHostKey(lr repo.LockedRepo) (crypto.PrivKey, error) {
 		return nil, err
 	}
 
-	kbytes, err := pk.Bytes()
+	kbytes, err := crypto.MarshalPrivateKey(pk)
 	if err != nil {
 		return nil, err
 	}