diff --git a/test/plugins/auth/ldap.ts b/test/plugins/auth/ldap.ts
index 8f26ba81..74a606df 100644
--- a/test/plugins/auth/ldap.ts
+++ b/test/plugins/auth/ldap.ts
@@ -16,7 +16,9 @@ const primaryKey = "uid";
 const serverPort = 1389;
 
 function normalizeDN(dn: string) {
-	return String(ldap.parseDN(dn).toString());
+	// warning is bogus in this case
+	// eslint-disable-next-line @typescript-eslint/no-base-to-string
+	return ldap.parseDN(dn).toString();
 }
 
 function startLdapServer(callback) {