diff --git a/fw-addr-lists.rsc b/fw-addr-lists.rsc
index 787d2752..1bc8a9c7 100644
--- a/fw-addr-lists.rsc
+++ b/fw-addr-lists.rsc
@@ -23,6 +23,7 @@
   :global FetchHuge;
   :global GetRandom20CharAlNum;
   :global HumanReadableNum;
+  :global IfThenElse;
   :global LogPrint;
   :global LogPrintOnce;
   :global LogPrintVerbose;
@@ -137,7 +138,7 @@
             :if ([ :typeof $Slash ] = "num") do={
               :set Net [ :toip [ :pick $Address 0 $Slash ] ]
               :set Cidr [ :pick $Address ($Slash + 1) [ :len $Address ] ];
-              :set Address (([ :toip $Net ] & ($Maskv4->$Cidr)) . "/" . $Cidr);
+              :set Address (([ :toip $Net ] & ($Maskv4->$Cidr)) . [ $IfThenElse ($Cidr < 32) ("/" . $Cidr) ]);
             }
             :set Branch [ $GetBranch $Address ];
             :set ($IPv4Addresses->$Branch->$Address) $TimeOut;