diff --git a/fw-addr-lists.rsc b/fw-addr-lists.rsc
index 883e1e98..bffbf100 100644
--- a/fw-addr-lists.rsc
+++ b/fw-addr-lists.rsc
@@ -67,7 +67,7 @@
     :local Address [ /ip/firewall/address-list/get $AddressList ];
     :set ($Maskv4->($Address->"comment")) [ :toip [ :pick ($Address->"address") 0 [ :find ($Address->"address") "/" ] ] ];
   }
-  :set ($Maskv4->32) 255.255.255.255;
+  :set ($Maskv4->"32") 255.255.255.255;
 
   :local Maskv6 ({});
   :for I from=0 to=128 do={