---
 src/Toolkit.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Toolkit.js b/src/Toolkit.js
index d4e579b..008a04c 100644
--- a/src/Toolkit.js
+++ b/src/Toolkit.js
@@ -72,7 +72,7 @@ Ext.apply(Ext.form.field.VTypes, {
     MacAddressText: gettext('Example') + ': 01:23:45:67:89:ab',
 
     MacPrefix: function (v) {
-        return /^[a-f0-9][02468ace](?::[a-f0-9]{2}){0,2}:?$/i.test(v);
+        return 
/^[a-f0-9][02468ace](?::[a-f0-9]{2}){0,2}(?::[a-f0-9]?)?$/i.test(v);
     },
     MacPrefixMask: /[a-fA-F0-9:]/,
     MacPrefixText:
-- 
2.47.3



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