diff --git a/internal/sshmanager/knownhosts.go b/internal/sshmanager/knownhosts.go
index 1dac65f..1ac438f 100644
--- a/internal/sshmanager/knownhosts.go
+++ b/internal/sshmanager/knownhosts.go
@@ -6,6 +6,8 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+
+	"golang.org/x/crypto/ssh"
 )
 
 type KnownHost struct {
@@ -38,7 +40,11 @@ func AddKnownHost(sshDir, host string, port int, keyData []byte) error {
 		addr = fmt.Sprintf("[%s]:%d", host, port)
 	}
 
-	line := fmt.Sprintf("%s %s\n", addr, strings.TrimSpace(string(keyData)))
+	pubKey, err := ssh.ParsePublicKey(keyData)
+	if err != nil {
+		return fmt.Errorf("parsing host key: %w", err)
+	}
+	line := fmt.Sprintf("%s %s\n", addr, strings.TrimSpace(string(ssh.MarshalAuthorizedKey(pubKey))))
 	if _, err := f.WriteString(line); err != nil {
 		return err
 	}