diff --git a/files/www/cgi-bin/sysinfo.json b/files/www/cgi-bin/sysinfo.json
index 42f1188a..d6be83d7 100755
--- a/files/www/cgi-bin/sysinfo.json
+++ b/files/www/cgi-bin/sysinfo.json
@@ -160,7 +160,7 @@ for pos, i in pairs(ift) do
 		nim['name']=i.name
 		ipv4=tostring(i.ipaddrs[1])
 		nim['ip']=ipFromCIDR(ipv4)
-		nim['mac']=i.macaddr
+		nim['mac']=i.macaddr:upper()
 		table.insert(tif,nim)
 	end
 end