diff --git a/specification/redis/resource-manager/Microsoft.Cache/stable/2020-12-01/redis.json b/specification/redis/resource-manager/Microsoft.Cache/stable/2020-12-01/redis.json
index 03005940c1f2..fc9dceebed1f 100644
--- a/specification/redis/resource-manager/Microsoft.Cache/stable/2020-12-01/redis.json
+++ b/specification/redis/resource-manager/Microsoft.Cache/stable/2020-12-01/redis.json
@@ -2397,7 +2397,8 @@
         "maintenanceWindow": {
           "type": "string",
           "format": "duration",
-          "description": "ISO8601 timespan specifying how much time cache patching can take. "
+          "description": "ISO8601 timespan specifying how much time cache patching can take.",
+          "default": "PT5H"
         }
       },
       "required": [