diff --git a/testrunner/config/default.yaml b/testrunner/config/default.yaml
index 780ddfa..46e8450 100644
--- a/testrunner/config/default.yaml
+++ b/testrunner/config/default.yaml
@@ -42,8 +42,8 @@ redis:
   port: null
   host: null
   password: jgsay7f2fgfgda6acCa7g()jaba51!
-  tls: undefined
-
+  tls: null
+  
 # Verbose log level or not
 log:
   verbose: false
diff --git a/testrunner/src/validateconfig.js b/testrunner/src/validateconfig.js
index 63da047..2b97646 100644
--- a/testrunner/src/validateconfig.js
+++ b/testrunner/src/validateconfig.js
@@ -37,7 +37,8 @@ const locationSchema = Joi.object({
 const redisSchema = Joi.object({
   port: Joi.number().allow(null),
   host: Joi.string().allow(null),
-  password: Joi.string().allow(null)
+  password: Joi.string().allow(null),
+  tls: Joi.boolean().allow(null).optional()
 });
 
 // Logging schema