diff --git a/src/server/config/schema.js b/src/server/config/schema.js
index 3c3d37664ee2..c54b38ddd524 100644
--- a/src/server/config/schema.js
+++ b/src/server/config/schema.js
@@ -71,7 +71,7 @@ export default () => Joi.object({
         then: Joi.required()
       }),
       keyPassphrase: Joi.string(),
-      certificateAuthorities: Joi.array().single().items(Joi.string()),
+      certificateAuthorities: Joi.array().single().items(Joi.string()).default([]),
       supportedProtocols: Joi.array().items(Joi.string().valid('TLSv1', 'TLSv1.1', 'TLSv1.2')),
       cipherSuites: Joi.array().items(Joi.string()).default(cryptoConstants.defaultCoreCipherList.split(':'))
     }).default(),