diff --git a/apps/files_external/lib/Lib/Auth/PublicKey/RSAPrivateKey.php b/apps/files_external/lib/Lib/Auth/PublicKey/RSAPrivateKey.php
index 8e29877818340..8d04bd07c4ab1 100644
--- a/apps/files_external/lib/Lib/Auth/PublicKey/RSAPrivateKey.php
+++ b/apps/files_external/lib/Lib/Auth/PublicKey/RSAPrivateKey.php
@@ -34,7 +34,8 @@ public function __construct(IL10N $l, IConfig $config) {
 				(new DefinitionParameter('password', $l->t('Password')))
 					->setFlag(DefinitionParameter::FLAG_OPTIONAL)
 					->setType(DefinitionParameter::VALUE_PASSWORD),
-				new DefinitionParameter('private_key', $l->t('Private key')),
+				(new DefinitionParameter('private_key', $l->t('Private key')))
+					->setType(DefinitionParameter::VALUE_PASSWORD),
 			]);
 	}