diff --git a/config/discourse_defaults.conf b/config/discourse_defaults.conf
index d251d30efb2..ee87099158d 100644
--- a/config/discourse_defaults.conf
+++ b/config/discourse_defaults.conf
@@ -99,7 +99,7 @@ redis_port = 6379
 redis_slave_host =
 
 # redis slave server port
-redis_slave_port =
+redis_slave_port = 6379
 
 # redis database
 redis_db = 0