diff --git a/manifests/firewall.pp b/manifests/firewall.pp
index 651bf112588ccc7d75ca9199b2722b9b6bd4a5c1..857bbce5378d457ce425011d50b8a86bbdcd346c 100644
--- a/manifests/firewall.pp
+++ b/manifests/firewall.pp
@@ -3,6 +3,7 @@ class puppet_cwsens::firewall{
 
   $mqtt_rule = @("EOT"/L)
     require services
+    service mqtt is { tcp/1883 }
     policy ipsum-mqtt chain ipsum-mqtt is
       accept service:mqtt from class:liu-nets
     end policy