diff --git a/lib/kast.js b/lib/kast.js
index e33dec6b..11ea2083 100644
--- a/lib/kast.js
+++ b/lib/kast.js
@@ -314,6 +314,7 @@ const format = (o, isRaw = false, mixFix = false, colorize = false) => {
       "_&Int__INT-COMMON"  : " & "   ,
 
       "_++_WS"             : " ++ "  ,
+      "_:_WS"              : " : "   ,
 
       "_+Word__EVM-DATA"   : " +W "  ,
       "_-Word__EVM-DATA"   : " -W "  ,