diff --git a/app/models/host_machine.rb b/app/models/host_machine.rb
index 891f7277..a5210726 100755
--- a/app/models/host_machine.rb
+++ b/app/models/host_machine.rb
@@ -42,6 +42,7 @@ def sysadmins
         collect(&:user_id)
       host_users = users.uniq
       REDIS_CACHE.set("#{HOST_UID_PREFIX}:#{name}", host_users.to_json)
+      REDIS_CACHE.expire("#{HOST_UID_PREFIX}:#{name}", REDIS_KEY_EXPIRY)
     end
     host_users
   end