diff --git a/main.go b/main.go
index ecaae6a..1c4625b 100644
--- a/main.go
+++ b/main.go
@@ -40,7 +40,7 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
-		block, err := ssh.MarshalPrivateKey(signer, "")
+		block, err := ssh.MarshalPrivateKey(key, "")
 		if err != nil {
 			log.Fatal("Failed to marshal host key:", err)
 		}